Trolls in literature
In J. R. R. Tolkien's world of Middle-earth, trolls are very large (around 9 feet tall) humanoids of poor intellect. They turn to stone when exposed to sunlight and they enjoy eating hobbits and dwarves. In The Lord of the Rings, a new breed appears, called the Olog-Hai. Unlike the old trolls, they are capable of speech and movement under sunlight. It is unknown how Sauron the Enemy managed to breed them - though it is stated by an Ent that Trolls were "made in mockery of" Ents, similarly to the way that Orcs were bred from captured and tormented Elves. It is not known how serious this hint is intended to be, as Tolkien did not discuss in detail the ways in which "good" beings could be corrupted to evil.
In the Discworld books by Terry Pratchett, Trolls are large creatures who are composed of rock. They have a tendency towards violence, and their intelligence is inversely proportional to the temperature, making them quite unintelligent in warm climates.
In the Dungeons & Dragons role-playing game, trolls are tall and skinny monsters with large, pointy noses and green skin. In D&D, trolls steadily regenerate all damage unless it is caused by acid or fire. (This version of troll originated with the Poul Anderson story Three Hearts and Three Lions.)
In the Earthdawn role-playing game, trolls are a tall, muscular and honorable race which players can role-play. Earthdawn trolls have curling horns like goats, lots of body hair and enlarged lower canines.
In the world of Harry Potter, trolls are giant monsters that kill everyone they encounter. In Harry Potter and the Philosopher's Stone Harry and Ron save Hermione from a full-grown mountain troll. There are a few other subsequent mentions of trolls; for example it was rumored that Harry's Firebolt, which Dolores Umbridge "confiscated" was guarded by troll. In the film, the troll was animated with computer-generated imagery.
In the TV mini-series The 10th Kingdom, trolls are the ruling race of the 3rd kingdom, having large pointy ears and noses wild hair, poor intelligence and a love of shoes and leather.
Troll dolls
A much more harmless variant of trolls are troll dolls, a type of toy doll that became a fad after its creation in 1959 by Danish Woodcutter Thomas Dam. Although retaining the fabled ugliness of trolls, troll dolls are also cute and cuddly, according to some tastes.