The Snow Monster is a Corrupted GemQuartz that first appeared in the episode "Gem Hunt". She was held captive by Jasper until "Earthlings", where she was forced into a fusion and sequentially fled after breaking apart from it. Her location and status are currently unknown.
The Snow Monster is a giant wolf-like creature with two horns. She has a mixture of turquoise-blue colors, with pink spots across her body. Though her original uncorrupted form is unknown, Jasper believed her (and, by extension, the similar Biggs Jasper) to be a Quartz Gem like herself.
In "Gem Hunt", she and Biggs Jasper are shown roaming the Great North and trying to evade Jasper. She is eventually found, poofed, and taken prisoner by Jasper alongside the other monster.
In "Earthlings", she is shown imprisoned in the Beta Kindergarten alongside the rest of Jasper's Corrupted army. Jasper attempts to force a fusion with her to battle Smoky Quartz, but she breaks apart from the fusion and flees from Jasper.