Wood Frogs can be frozen solid and still be alive and moving when reheated.
In the winter time these frogs become as hard as rocks, their brains shut down and their hearts stop beating. When winter ends, they thaw out and spring back to life.
You can also freeze and unfreeze them in a laboratory. You can see for yourself in this video.
67% of the frog's body freezes hard but not inside the cells. As the frog slowly freezes over several hours, he pumps large amounts of glucose anti-freeze into his cells. Gradually he stops breathing, his heart stops, his brain activity ceases but his cells don't freeze. In short, Wood Frogs are the Han Solos of the animal kingdom.