Think of all the D&D monsters inspired directly or indirectly by the "trolls" of northern Europe. These include ogres, orcs, hobgoblins (which are far more trollish than they are hobgoblinish--a "hob goblin" was either a helpful goblin or a tiny, mischief-making fairy), hill giants, gigantes, and fomor giants. Oddly enough, the D&D "troll" bears no real resemblance to legendary trolls and was lifted straight out of a P. Anderson novel (Three Hearts and Three Lions).