▁nä cken ▁in ▁Sweden . ▁It ▁is ▁associated ▁with ▁rivers ▁( S wed ish ▁name ▁" Str öm kar len " ▁means ▁" The ▁River ▁Man ") ▁and ▁particularly ▁with ▁water falls ▁( f oss ▁in ▁Norwegian ) ▁and ▁mill ▁races . ▁ ▁Description ▁F os se gr im ▁is ▁described ▁as ▁an ▁exception ally ▁tal ented ▁f idd ler : ▁the ▁sounds ▁of ▁forest , ▁wind ▁and ▁water ▁play ▁over ▁his ▁fiddle ▁strings . ▁ ▁F os se gr ims ▁can ▁be ▁induced ▁to ▁teach ▁the ▁skill . ▁The ▁Swedish ▁str öm kar l ' s ▁lay ▁is ▁said ▁to ▁have ▁eleven ▁variations , ▁the ▁final ▁one ▁being ▁reserved ▁for ▁the ▁night ▁spirits ▁because ▁when ▁it ▁is ▁played , ▁" tables ▁and ▁ben ches , ▁cup ▁and ▁can , ▁gray - be ards ▁and ▁grand m oth ers , ▁blind ▁and ▁l ame , ▁even ▁b ab es ▁in ▁the ▁cr ad le " ▁will ▁begin ▁to ▁dance . ▁▁ ▁F os se gr im ▁is ▁said ▁to ▁be ▁willing ▁to ▁teach ▁away ▁his ▁skills ▁in ▁exchange ▁for ▁a ▁food ▁offering ▁made ▁on ▁a ▁Th urs day ▁evening ▁and ▁in ▁secre cy : ▁a ▁white ▁he - go at ▁thrown ▁with ▁head ▁turned ▁away ▁into ▁a ▁water fall ▁that ▁flows ▁north wards , ▁or ▁ ▁sm oked ▁m utton ▁( fen al år ) ▁st olen ▁from ▁the ▁neighbour ' s ▁storage ▁four ▁Th urs days ▁in ▁a ▁row . ▁If ▁there ▁is ▁not ▁enough ▁meat ▁on ▁the ▁b one , ▁he