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I just bought one of those "As Seen On TV!" thawing plates and it really works.
A beefy medium rat was totally thawed in less than a half hour and didn't have that icky, soggy, potential-meat-grenade feel that warm water thawing gives it.
It actually felt more like a firm pre-killed instead of F/T.
I dunked the bag in hot tap water for about 10 minutes to get the inside up to temps and Leah ate it with gusto.
Last night she refused a rat that I'd thawed the "normal way".
They're not expensive and it's easier than dunking a whole pile of rats/mice in hot water.
It's about a foot long by 8 inches wide or so and there's plenty of room for lots of frozen critters on it.