All right. They did evolve by chance, but not by snowflakes. They’re part of a long chain reaction that eventually resulted in the evolution of human beings, who then gathered the snowflakes, and shaped them into balls, with sticks for arms and carrots for noses.

Now, how those snow-people are having a conversation is beyond me. As far as I know, inanimate objects don’t speak intelligable words of their own volition. Yet. (A.I joke in there somewhere)