Ice Gremlins

Ice Gremlins were a breed of Greenskin native to the far north, lurking in the same ice caverns of Ice Mountain in "The Northlands", (possibly located between Kislev and Norsca), same as the Frozen Horror and its Polar Bear Beastmen known as "Polar Warbears" and Yeti that it has as minions, within the old Heroquest expansion "Lair of the Frozen Horror". The Heroquest setting was originally within the early version of the Warhammer universe, with Magnus the Pious being mentioned. The Ice Gremlins resembled goblins wearing Santa Claus outfits, complete with long white beards. Since Greenskins are fungus and hairless nowadays, this could be explained as being a result of the Ice Gremlins breeding their own Hair Squigs, or, for a more grimdark take, ripping the beards off of the faces of captured Norse Dwarfs and curing the unfortunate dorfs' faces to serve as a mixture of face-warmer and grisly trophy.