Yool

The Yool is a stout, bearded monster whose upper parts are covered in white fur.

Like many species of real-life reindeers, Yools are antler-bearing, have hooves as feet, and brown hair covering their legs. Unlike a reindeer, however, the monsters are bipedal, have elf-like ears and candy-cane-patterned arms, with red and white stripes. The central part of the body of a Yool is green and has snowflake-like patterns on it.

Furthermore, all Yools have sleigh bells on their antlers, that are used by the monsters to produce their songs.

https://vignette.wikia.nocookie.net/mysingingmonsters/images/8/80/Yool.png/revision/latest/scale-to-width-down/350?cb=20191027013027