Gak

Gak was a skeleton warrior appearing in The Last Hero. One of the minions of the Dark Lord Evil Harry Dread, he was armed with a rusty sword and scraps of armour.

It is unsure what, if any, difference there is between a zombie and a skeleton, save that one has more flesh remaining. Having long ago lost his vocal cords and tongue the only sound it could make was 'gak' hence it's name.