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So I found this, and thought it was pretty interesting. Haven't had time to really read through it, but it basically sounds like they have antifreeze mechanisms that protect the organs from freezing, even if some of the water content of their body is frozen. I didn't get far enough to read what the researchers considered 'survival' either; long-term no side-effects, or just regaining consciousness with no major organ failure. Sounds more like something that would help if they got caught out in a frost than a true freeze-survival adaptation like you see in some salamanders though...
Just thought it was interesting and wanted to put it up here!