The North American wood frog has one of the most amazing adaptations I’ve ever seen or heard of: in winter, it turns itself into a frogsicle.
The moment it touches an ice crystal, signals are set off which cause it to pull water away from the center of its body, encasing the internal organs in a pool of water which then freezes. Though the frog is not dead, its heart stops beating and all other organ activity ceases as well.
When it warms back up, the frog thaws out and goes on with its life! Check out this video that talks about it in a little more depth: