Congrats on getting him to switch! Am I correct in understanding that he IS eating, just not as quickly as before? And your question is: how to properly heat up a frozen rat?
Here's the usual protocol, with plenty of options:
1) Defrost the rat (approx. 30min in cool tap water, about an hour at room temperature, or a few hours in the fridge)
2) Heat the rat until warm to the touch (10min under HOT running water, OR submerged for 10min in not-quite-boiling water, OR heated with a hair dryer). NEVER microwave the rat!
Step 1 is optional if you would rather leave the rat for longer in hot water. You just want to make sure the rat is completely warmed all the way through and quite warm to the touch - as if it were still alive!
By the way, when you say he "doesn't like the tub you feed him in"... is it the same cardboard box in which you were feeding him live rats?
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