Thanks.
He is in a tank in my bedroom. I thawed the rat in the bathroom sink, in a plastic bag submerged in warm water. After it thawed there was quite a bit of water in the bag, so maybe the bag is unnecessary as I ended up drying it anyway. Next time I may try putting it straight into a bowl of water in the room, but now that I think of it, I have a live rat housed in the same room right now. Last night before I went to bed I opened the tub I have the rat in to check his food and such and the smell was apparent to me with a terrible nose so I'm sure he noticed. I set everything back, turned the light off and got in bed. Seconds later I heard a couple hisses, or maybe my dog was sniffing outside my door. I got up and turned the light on and he was out and looking to strike. After the first time I fed him I thought he was hungry a few days later when I held him. I think he's still hungry now because he's already hanging his head out of his hide, though most of his body is in there. I might try to feed him again on Wednesday, less than three days later but more than 48 to allow for digestion, just to test my feeling.
The thawing process I learned from these forums and it worked well.