Folklore says that if you ever meet a troll that is in a bad mood and tries to attack you, you can try to guess its name and say it out loud. Trolls can't stand the sound of their own name, so if you guess correctly the troll will either drop dead or escape.
According to Scandinavian folklore, trolls dwell inside mountains and rocks in their own realms. The portals to the realm of the trolls are usually very well hidden, and trolls are known to guard their doors strictly.
In Scandinavian folklore, a troll cat is a cat that is made by a witch from bones, sticks, wool, hair, nails, graveyard soil and metal scraped off church bells. It was believed that the troll cat gained life in a magic ritual where blood was sacrificed.
The Ash Tree Lady (Askefruen) is a malevolent tree spirit in Scandinavian folklore and the guardian of the ash tree. It was believed that peeing on the roots of an ash tree that was inhabited by an ash tree lady, would result in severe illness and sometimes death. Many people feared going near ash trees at night.
According to Scandinavian folklore, fairies are shapeshifters that can take on various guises. Sometimes they take the form of insects or frogs, and other times they appear as a white mist hovering above the meadow. They can also be invisible.