Fossegrim, also known simply as the grim (Norwegian) or Strömkarlen (Swedish), is a water spirit or troll in Scandinavian folklore. Fossegrim plays the fiddle, especially the Hardanger fiddle. Fossegrim has been associated with a mill spirit (kvernknurr) and is related to the water spirit (nokken) and is sometimes also called näcken in Sweden. It is associated with river streams (Swedish name "Strömkarlen" means "The water stream Man") and particularly with cascading streams (foss in Norwegian) and mill races.[1][2][3]
^Benjamin Thorpe, Northern Mythology: comprising the principal popular traditions and superstitions of Scandinavia, north Germany, and the Netherlands, 3 vols. London: Lumley, 1851–52, OCLC656592812, Volume 2 Scandinavian Popular Traditions and Superstitions, p. 23.
^Eugen Mogk, Mythologie, Grundriß der germanischen Philologie 1, Strasbourg: Trübner, 1891, OCLC162976637, p. 1028(in German) equated them, but Reimund Kvideland and Henning Sehmsdorf, Scandinavian Folk Belief and Legend, Nordic Series 15, Minneapolis: University of Minnesota, 1988, ISBN9780816615032, p. 248, distinguish the "mill sprite" as a mischievous creature who punishes grinding on Christian holy days.