I feed most of my collection f/t as well. From a safety perspective, it's fine to refreeze as long as you've thawed the rat(s) in a refrigerator that didn't get above 40°F. If you thawed at temperatures warmer than that (or they've been left out for longer than 2 hours), just throw it out and chalk it up to a lesson learned - don't thaw f/t rats for him when he's in blue.
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