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Trolls
Troll heads, as drawn by Matt Smith, with a deep nod to the far more talented Mr Kidby
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Huge moving, living rocks of humanoid shape, with intelligence and personality: in other words, trolls are sentient beings. Trolls have interesting seams of valuable minerals as their blood vessels and nervous system. This phenomenon has at least two repercussions. One: a troll's brain, silicon-based, will overheat and slow down in Ankh-Morpork (where everyone wants to live), and the troll will become sadly stupid; the brain will also overheat in strong sun, causing trolls to stop moving in daylight. Two: when a troll has stopped moving while his brain has overheated in daylight, this troll will look just like a lump of rock, with interesting seams of valuable minerals, and may be (and have been) attacked by mining dwarfs. This is very likely the initial cause of the animosity between trolls and dwarfs, even though, after hundreds of years, the feud goes on because it is a cultural tradition for both species. It being a cultural tradition does not mean it is nice; trolls and dwarfs have repeated the Battle of Koom Valley several times, each side springing an ambush on the other, casualties are high. The hostility lives on and is found in any place with a significant number of both species, for example, Ankh-Morpork; a serious riot has occurred in Men at Arms.

Neither have Trolls gotten on well with humans, through most of history. Not being able to digest carbon-based life forms didn't stop them from eating them, and a belt of human skulls used to be a popular fashion statement among male Trolls. Naturally, this sort of thing led to retaliation and a lot of derogatory bedtime stories. Nowadays, relations are much more peaceful all around, and the game of Aargrooha has nearly disappeared. Trolls retain a fear and loathing of billy-goats, however. It's something like elephants and mice.

Trolls all look the same except the bit under the loincloth, and they don't wear much more clothing than that, but trolls have much more gender discrimination than dwarfs. Female trolls use distinctly female names (names of precious or semi-precious stones). In some regions, male trolls expect female trolls to polish, and forbid female trolls growing lichen (as a human might keep her hair long), since "bald is modest" (Monstrous Regiment). Traditionally, troll courtship consists of a male troll using a rock to hit the female on the head to prove his strength, and then for the rest of her life, the female troll will be home subduing whatever prey that the male brings home for dinner. When female trolls with human friends compare their experiences and future prospects, the troll women find that their way is not at all romantic, and they wonder why they have almost no say in who they are to marry (Moving Pictures).

Trolls are large and powerful, but have never been a political force to be reckoned with in their home mountains (where it is nice and cold and trolls are clever), except for warring against the dwarfs. Trolls generally come from the Ramtops or Überwald; in the Ramtops, trolls are considered a nuisance; in Überwald, trolls are either enemies of dwarfs or treated as semi-sentient slaves (see The Fifth Elephant). In Bonk, Überwald, trolls are considered properties and need to carry a passport signed by their owners. Only in Ankh-Morpork have trolls been able to influence some policies by being a large immigrant group. They have a rather inefficient crime syndicate called the Breccia, led by the troll Chrysoprase, who is the fastest in assimilating into the city human society. Trolls have also organized the Silicon Anti-Defamation League to improve the image of trolls in the cities.

Trolls
Troll heads, as drawn by Matt Smith
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Trolls have teeth of diamond. A troll dentist might also be a rich diamond merchant. A troll gangster might wear the teeth of his former enemies as jewelry. While most trolls are capable of growing diamond teeth (and possibly regenerating fresh diamond, just as rodents' teeth continually grow from undrneath to replace what is ground away on the top?) this is as far as it goes for most trolls. But just once in a while, trollish genetics throws up a Diamond Troll made entirely of diamond. Such a being is naturally super-intelligent as (s)he can regulate his own bodily temperature - evidenced by the thin layer of frost on the outside that also serves as protection against the glare for onlookers. Diamond Trolls, by custom and precedent, generally gravitate to the position of High King or equivalent over the whole of Trolldom. However, the current pretender is unique in that he shares a character trait with Carrot Ironfoundersson - he doesn't want the kingship, but reserves a right to step into his inheritance if the need is great enough. Mr Shine is content to remain incognito in Ankh-Morpork, teaching Thud and working for greater understanding between Trolls and Dwarfs.

List of known/named trolls

Trolls
More trolls, as drawn by Matt Smith
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