Mamoswine?

Not yet despite it being the perfect time for a release

Niantic has yet to release the following evolutions for Mons from previous gens: Mamoswine, Magnezone, Lickylicki, Leafeon, Glaceon, Probopass, Ambipom, Tangrowth, Yanmega, Gallade, and Froslass.

I am really hoping that having all these Swinubs in the wild and Piloswine as a raid boss is a precursor to Mamoswine coming soon, and not just generic ice Pokémon because it's winter...