Jenny Greenteeth
Region of origin: Lancashire, England
A river-hag related to other aquatic fae creatures like the grindylow, Jenny (or Jinny or Ginny or…) Greenteeth lived in stagnant, murky waters in western England near Lancashire and Liverpool and would pull down anyone who ventured too close to the water’s edge, drowning them. Parents would use warnings of Greenteeth to keep small children away from the water and keep them from accidentally falling in. Claiming it may her hair as she sat in the water lurking, she also became associated with pondscum and duckweed or other floating water-plants, that may in reality tangle the child up and prevent them from being able to get back out to dry land. She was similar to Peg Prowler, another hag said to inhabit the River Tees further up north.
The Compendium of Arcane Beasts and Critters 