A lot of people use the fridge to defrost. I prefer not to. Even defrosted in the fridge it's going to be cold. So you would need to safely warm up somehow, probably room temp water, before heating up quickly in hot water and/or with a hair dryer.
IMO, just drop in the room temp water in a plastic bag a few hours before feeding. Then you kill two birds with one stone. Make sure thawed through, then drop in the hot water for a 1/2 minute, and/or use the hairdryer. I find the hot water is faster and more through at warming. Just my opinion though.
Plus, my fiancé does not like rodents in the fridge! I have a separate chest freezer for all my snake food!