Noun
tommyknocker (plural tommyknockers)
(folklore) A mythical creature, like a brownie or leprechaun, believed to live in underground tunnels; later associated with dead miners.
Late last night and the night before, tommyknockers, tommyknockers knocking on my door. I wanna go out, don't know if I can 'cuz I'm so afraid of the tommyknocker man. Stephen King