The freezer is very inhumane--the animals will suffer pain. How much pain do you feel just being outside long enough for your feet to go numb? Reptiles do not hibernate--they brumate, remaining conscious through the whole thing.
If avoiding suffering is your primary concern, and not secondary to your own feelings, then completely destroying the animal's brain with a sharp blow from a very heavy, large object will be a humane way to euthanize it. There is some question as to how humane some veterinary drugs are for reptiles, as they can take quite some time to kill the animal. Reptiles, with their very slow metabolism, cannot even be counted on to die quickly if you cut off their head!
In my opinion, total destruction of the brain is the most humane method. It's absolutely horrifying to have to do that, but you can be sure that it's instant and painless.
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