In Scandinavian folklore, Fuligo septica is identified as the vomit of troll cats.
"I give you blood,
Satan gives you power.
You shall run for me on earth,
I shall burn for you in hell.
You shall travel through forests and fields,
gathering milk and cream.”
-witch’s spell recorded in Sweden, 1908
Such invocations to Satan were necessary because the witch herself was unable to give life to any of her creations. Droppings from the troll cat (or, the excess milk they had lapped up too greedily and vomited up) could, if they were burned, cause the witch to feel sympathetic pain.
July 4, 2013 - Humboldt State Park, CA
 Kvideland, Reimund; Sehmsdorf, Henning K. (1988). “39. Troll Cat”. Scandinavian Folk Belief and Legend. Minneapolis: U of Minnesota P. pp. 175–79. ISBN 0816619670.
 Alver, Bente G. (1989). Kvideland, Henning K.; Sehmsdorf; Simpson, Elizabeth, eds. Nordic Folklore: Recent Studies. Bloomington: Indiana UP. pp. 110–28. ISBN 9780253205216.