I always used to do it like so:

Pop em out of the freezer and into a ziploc (whatch them lil claws can perforate the bag)

Fill Igloo (or styro) cooler with hot water

Pop in bag and retreive when ready to roll

If they got wet i sat em under a heat lamp a few minutes

Touched their heads/noses to the bulb for that bright heat stamp

Present to snakes who would almost invariably WHOMP on it.