There were seven and a hundred Trolls, They were both ugly and grim
Danish Ballad of Eline of Villenskov
A troll is a fearsome member of a mythical anthropomorph race from Scandinavian folklore. Similar to the ogres of English fairy tales – to a devious, more human-like folk of the wilderness, living underground in hills or mounds. They could also be known as hill-folk or mound-folk. In Shetland and Orkney tales, trolls are called trowe.
The meaning of the word troll is uncertain. It might have had the originally meaning of supernatural or magical with an overlay of malignant and perilous. Another likely suggestion is that it means "someone who behaves violently". In old Swedish law, trolleri was a particular kind of magic intended to do harm. It should be noted that North Germanic terms such as trolldom (witchcraft) and trolla/trylle (perform magic tricks) does not imply any connection with the mythical beings. Moreover, in the sources for Norse mythology, troll can signify any uncanny being, including but not restricted to the Norse giants (jötnar).
In fairytales and legends trolls are less the people living next to humans and more frightening creatures. Particularly in these tales they come in any size and can be as huge as giants or as small as dwarves. They are often regarded as having poor intellect (especially the males, whereas the females, trollkonor, may be quite cunning), great strength, big noses, long arms, and as being hairy and not very beautiful (Once again, females often constitute the exception, with female trolls frequently being quite comely). In Scandinavian fairy tales trolls sometimes turn to stone if exposed to sunlight.