Like a normal snow golem, the mutant snow golem automatically attacks hostile mobs, except instead, he throws huge chunks of ice or presents which deal up to 3 hearts of damage.
The mutant snow golem also automatically freezes every water block nearby and also creates a path of snow. This only works when it is standing on the ground.
If your mutant snow golem is injured, the player can throw some snowballs at it. It'll heal one heart per snowball. If you want your mutant snow golem to follow you, right-click it and your name will appear above its head and it'll follow you. Note that it may take the weirdest path to reach you due to it's poor vision.
If you manage to knock a mutant snow golem into the water (without it freezing the water), it'll deal 8 hearts of damage to the mutant snow golem. Upon death it will drop 32-48 snowballs and it's head.