Scandinavian folklore

Scandinavian folklore or Nordic folklore is the folklore of Norway, Sweden, Finland, Denmark, Iceland and the Faroe Islands.

Collecting folklore began when Gustavus Adolphus of Sweden sent out instructions to all of the priests in all of the parishes to collect the folklore of their area in the 1630s. They collected customs, beliefs that were not sanctioned by the church, and other traditional material.

Iceland and the Faroe Islands are not part of Scandinavia (although they are Nordic countries), but can nevertheless be regarded as Scandinavian in folkloric terms. Because of their common Germanic origin, Scandinavian folklore shows a large correspondence with folklores elsewhere, such as England and Germany, among others. Most of what has survived there might be found, of a similar nature, in Finland and Sapmi and to a lesser extent in the Baltic countries.

A large number of different mythological creatures from Norse mythology continue to live on in Scandinavian folklore, little affected by Christian beliefs, even though the wicked ones at times find an ally in the Devil or have problems with Christian symbols. These beings could be scared by a piece of iron or steel, such as a strategically placed pair of scissors or a knife, or with salt and fire. The stories about the livings and doings of these beings, and their interaction with humans, constitute the major part of Scandinavian folklore. Even the helpful tomte, nisse, gårdbo or gårdbuk could turn into a fearsome adversary if not treated with caution and respect. Many of them blend into each other when their morals and/or place of residence are similar, and equally when one moves from one region in Scandinavia to another. When the folktales were collected and printed, the illustrators started to give shape to the creatures that had hitherto lingered in obscurity. The creatures underwent a metamorphosis and became concrete figures to the people of Scandinavian countries.

...
Wikipedia