My intervention

It was mid-November and the night time temperature was below freezing for many days. The surface water in my little pond was already frozen, about one inch thick. The wood was half-submerged in between ice and water. I couldn't lift it out of the pond, it got stuck.

"The frog wouldn't make it, seriously!" I told myself.

The temperature in the next few days got back to mid-30s, and the ice on the pond surface thawed. Out of curiosity, I wanted to lift up the wood and see. But before I did that, I grabbed an insect net, just in case if the frog was still there.

I turned the wood around... "Wow!" The frog was in the hole.

I wasn't in a hurry to net it, the reason? It looked like it had begun its hibernation... its limps were stretching a little, but not jumping away... or maybe it wanted to but couldn't. "Sorry, I wake you up, but I don't want to see your frozen dead body next Spring."

After shaking it off the wood into the net, I settled it in the breezeway for a while before taking it inside in an empty aquarium with only gravel and a little water in it.

Voila, it came back to life!