The Bøyg (Norwegian: Bøygen, pron. [bøyj]), also referred to as the "Great Bøyg of Etnedal", is a troll in the Scandinavian folklore of Gudbrandsdal and Telemark. Characterized as a giant, slimy serpent, it stands as a hindrance to travelers. It appears in the fairy tale of Per Gynt, the basis for Henrik Ibsen's play Peer Gynt.
References
Bøyg Wikipedia(Text) CC BY-SA