Culling mutated hatchlings:

[WingedWolfPsion]

I agree. I don't think that the reptiles have the capability of realizing what is happening when being frozen, because they are cold blooded and all their senses are slowed until they go unconscious.

This is a nice thought, but it's not a realistic thought. Do humans feel pain when they are hypothermic? Of course they do.

Ball pythons brumate. They do not fall asleep. They are awake when they're cold. They're slow, but they're awake. If you don't think a cold snake can sense and react to its surroundings, poke one with a pin. I guarantee you it will flinch--it's perfectly capable of feeling pain.
The snake may be incapable of moving at some point, but that doesn't mean it isn't feeling anything any longer. I don't know where you got the idea that nerve impulses were absent when it's cold.