Pontarf

The Pontarf is a monster from Medieval times in Europe. It was used as a bogeyman figure who snatched up unattended children. It is described as a giant fish who is found off the coast of Europe, that can stretch its body to steal children no matter how far inland they are.

Citations:

Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.