This may be a genuine issue. I have no clue as to the rules of Blizz spawning and my brief search through the cofh configs yielded no blizz spawning parameters. I presume there is a method of spawning legitimately since Lite modpacks usually have TE but no biome mods. But stranger things have happened.
I've never seen a Blizz outside of that one glacier biome before; I have a feeling that spawning is based on how cold the biome is, as well as the ground material there. Or the possibility that something's broken.