Mobs
Winter
Ice wolf-dont like ice chickens
snow golem-Boss
Ice chicken- just chicken
Nether
Eye of nether-annoing eye
Hisk-Trow potions wachout
Nether pig-Just pig
Other
Grass minion-drop grass
Rat-just rat
Coal minion-annoing in caves
Cave Villager-you can trade with him for emeralds spawn in cavebiome
Items
Ice Feather
Hearth of ice golem