Grypt

A Grypt (also known as Pollywiggle in Ilkley, as Candypole in Kettlewell, and as a Jarvis in Sheffield) is the larval stage in the life cycle of a Grindylow.

The work Aquatic Wonders of Yorkshire: A Wizard's Field Guide includes a depiction of the development of Grypts, with sketches illustrating them newly-hatched, at one week old, four weeks old, and six weeks old.