There are many possible answers to this question and you may choose the one you feel most comfortable with.
- They croak
- They hop it to somewhere warmer
- My throat
- Aquatic frogs submerge themselves and absorb oxygen from the water through their skin. Other frogs will bury themselves in leaves and mud to protect themselves from the worst conditions and hibernate until warmer months
- They involve themselves in a lengthy joke with a chicken that borrows books from a library
Any and some but certainly not all of the above may prove helpful.