These creatures are described as being very large and ugly, but they are not known for displaying very much intelligence.
Common features include horns, warts, hairy skin, long arms and humpbacks and these beasts have disfigured faces with huge noses, distorted eyes, deformed teeth and massive ears.
They are also known for being very unfriendly, or even cannibals or man-eaters.
In a lot of fairytales, Trolls are known to block passages for travelers.
They are known to live together, usually in parent and child groupings and it is also said that they usually only come out at night for food because any exposure to sunlight can turn them into stone.
Some Scandinavian stone landmarks are said to be hardened trolls who went out in daylight.