Inspired by the cubone-kangaskhan connection, the idea was to come up with another pokemon that's actually an existing pokemon after undergoing some sort of tragedy.
So, it would never be "confirmed" either in or out of canon, but "Wendisnow" here would really be the defoliated remains of an impossibly old, maybe even petrified Abomasnow. Grass/ghost with an ability that absorbs ice attacks as HP.