Looks like:
Strombie
Spawns in: Snowy Tundra
Drops: 0-5 Rotten Flesh, 0-10 Snowball, and 1 Snow Block.
Attack Methods:
Hit As strong as a player, inflects slowness 1 for 10 seconds.
Whatever this is called Throws a snowball and pushes you away.
Behaivor: Hostile
(note: may reference the Frozen Zombie from Minecraft Dungeons)