If your path takes you near a riverbed or across a stream, you'd best look out for Jenny Greenteeth. A water witch of greenish tinge with frog-like, yellow eyes as big as two lamps, Jenny dwells beneath the river's surface — darting like a fish across the muddy bottoms, and feeding upon the misfortunate who stumble and drown in her waters.
Origins in Lancashire
Jenny Greenteeth — also called Ginny Greenteeth, Wicked Jenny, or Peg Powler in some northern English traditions — originates primarily from Lancashire and Cheshire folklore. She is one of several "river hags" found across British mythology, along with the Scottish Nuckelavee and the Irish each-uisce (water horse).
Her name comes from the green weed that floats on still, stagnant water. To the uninitiated, a peaceful-looking pond covered in green duckweed might appear to be solid ground — and stepping onto it could mean being dragged beneath the surface to drown. Jenny was the personification of this danger: the malevolent spirit lurking beneath the inviting surface.
A Warning to Children
Like many water spirits in British folklore, Jenny Greenteeth served an important practical function: she was a warning to children about the dangers of rivers, ponds, and streams. Victorian parents who wanted to keep their children away from dangerous water would warn them that Jenny Greenteeth was waiting beneath the surface — ready to grab small legs and drag curious children down into the depths.
Similar figures exist in folklore around the world wherever bodies of water presented danger: the Slavic Rusalka, the German Nixe, the Scandinavian Näcken, the Japanese Kappa. The river hag is a universal archetype, born from the very real danger of water to communities that lived beside it.
Her Appearance
Descriptions of Jenny Greenteeth are remarkably consistent across Lancashire folk accounts. She is described as having:
- Long, straggly green hair matted with river weed
- Green skin the color of pond algae
- Long, sharp green teeth (hence her name)
- Yellow or orange lamp-like eyes
- Clawed, webbed hands capable of remarkable speed and strength
- A body that moves unnaturally fast through water
She is sometimes said to inhabit duckweed-covered ponds specifically, and accounts note that water covered in bright green algae was particularly suspicious — it might be Jenny Greenteeth's lair disguised as solid ground.
Jenny in Modern Culture
Today Jenny Greenteeth has found new life in fantasy literature and gaming, where she appears as a type of water hag — malevolent, cunning, and dangerous. She remains one of the most vividly imagined figures in British folklore: a warning dressed in green, waiting beneath the still water with her lamp-eyes gleaming, patient as the river itself.