Thaw the mouse like you would a steak (place in a baggy in luke-warm water) and leav it on the snakes enclosure for an nour or so, then take it out and warm it with a blowdryer (sounds gross, I know, but it works). You'll want to be holing the mouse with tongs at this point. Offer it and do the zombie mouse dance, he should snag it right up.
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