Entities hit by snowballs will gain the frost effect.

--'Frost Effect' is referring to the 1.17 snapshots-- The entity will receive a small duration of frost effect when hit by a snowball (multiple snowballs would cause a longer duration), therefore getting hit by a lot of snowballs would eventually cause slower movement and frost damage. Players can nullify the effects with leather armour like normal. This additionally would make Snow Golems more interesting (good for minigames, yet not too OP for mob defense).