Trolls are a fictional species archetype originating in Northern Mythology.
Trolls are one of the most varied creatures in folklore. The only consistent fact about them is that they are ugly humanoid creatures. Many are large, stupid, and somewhat similar to orcs except for their tendancy to be alone rather than in large groups. Classic fantasy trolls of this type often guard bridges. However, other types of trolls can be small and much less aggressive (similar to goblins), and may be associated with rocks, like elemental Gnomes.
Trolls in fiction or legends include: