When you freeze a reptile, ice crystals form in the cells before the brain dies. This means the animal feels its own eyes freezing, cracking, and bursting before it actually dies. You wouldn't know that by looks though. What you'd see is the animal sit very still and probably appear to be 'going to sleep.' In case this needs to be spelled out - they are cold-blooded animals. Without warmth they can't move - they become paralyzed.
If this needs to be translated to 'human terms' this is basically like being pinned down and microwaved without the ability to scream or thrash about because you're put under a drug that causes you to be physically paralyzed.
I'm not saying this to be brutal, I'm saying this to translate reality to people who seem to be incapable of educating themselves properly or understanding the topic.
Here is a nice picture that I do not own the rights to:
It's your ethical responsibility to internalize this information before incubating snake eggs.