"In Greek mythology, Mormo (Greek: Μορμώ, Μορμών, Mormō) was a spirit who bit bad children, and was said to have been a companion of the goddess Hecate.
The name was also used to signify a female vampire-like creature in stories told to Greek children by their nurses to keep them from misbehaving."
These sort of nurses should work to scare the hell outta potential converts to the Μορμών cult.