The Groke (original Swedish name Mårran) is a fictional character in the Moomin stories created by Tove Jansson. She appears as a ghost-like, hill-shaped body with two cold staring eyes and a wide row of white shiny teeth. In the book Who Will Comfort Toffle?, it is mentioned that she has a tail, but it has never been seen. Wherever she stands, the ground below her freezes and plants and grass die. She leaves a trace of ice and snow when she walks the ground.