[Snake]

If anything, that could just have it's momentum reduced to 1.

Or just a new condition where. "If you score a critical hit on an enemy standing on any Ice tiles, and they are suffering from Frostbite, they also get immobilized for 2 rounds, as the Ice creeps up their legs, keeping them in place."

Sadly, like Shujin tried to point out, it does 'nothing' worth it's Chimeric Eyes or Potential.