Others have covered the freezing question so I’ll just tag on something about your question of hunger: a simplified explanation would be to think of it like hibernation. They hunker down, don’t move, and break down stored nutrients (for wood frogs this tends to be the leg muscles) until the freeze is over. They don’t really need to use their legs while hibernating, and their legs contain a lot of nutrients because hopping around is energetically expensive so they’re a good target to break down. If you want to look further into Wood Frogs and freeze tolerance I recommend to works of JP Costanzo.
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