Troll:
A mythical, cave dwelling being depicted in folklore either as a giant or a dwarf, typically having a very ugly appearance.
Synonyms: Goblin, hobgoblin, gnome, genomos, gnomi, halfling, bugaboo, ogre, kobold, puck, gremlin, brownie, kelpie, nixie, trawl, pygmy, pygmaei, manikin, bugbear and imp.