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{2}: Target snow land you control becomes a 4/4 Elemental creature with hexproof and haste until end of turn. It's still a land. (A creature with hexproof can't be the target of spells or abilities your opponents control.)
A land that becomes a creature because of Avalanche Caller’s activated ability will retain any other supertypes, card types, subtypes, and abilities it had. In particular, it will be a snow creature land.
In most cases, the land that becomes a creature will remain colorless. If another effect caused the land to have one or more colors, the resulting creature land will retain those colors.
Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.
Snow isn’t a type of mana. If an effect says you may spend mana as though it were any type, you can’t pay for {S} using mana that wasn’t produced by a snow source.
Some cards have additional effects for each {S} spent to cast them. You can cast these spells even if you don’t spend any snow mana to cast them; their additional effects simply won’t do anything.
The Kaldheim set doesn’t have any cards with mana costs that include {S}, but some previous sets do. If an effect says such a spell costs {1} less to cast, that reduction doesn’t apply to any {S} costs. This is also true for activated abilities that include {S} in their activation costs and effects that reduce those costs.
The activated ability doesn’t cause the target snow land to become tapped or untapped.
The {S} symbol is a generic mana symbol. It represents a cost that can be paid by one mana that was produced by a snow source. That mana can be any color or colorless.
