High Fantasy 101
Curse those little green bastards! Goblins are skinny, green nuisances who usually live in caves they’ve dug out under hills and mountains but are sometimes found in raiding bands far from home. They’re practiced miners, and some more urbane cultures trade with the goblins for the contents of their rich, deep mines, happy to let the greenskins do the dirty work. Others, rather than fill the goblins’ coffers, simply raid their caves in force.
Goblins speak the same language as do orks, and the two may be the same species. No-one usually gets close enough to ask.