Many frogs hibernate during cold seasons when the
temperature can be as low as -7°C. They hide on the
ground in leaf litter and under rocks or tree roots.
The Wood Frog,
rana sylatica, that lives in N.America and Canada,
converts glycogen to glucose in their liver to produce
an 'antifreeze'. This means they can tolerate their
body fluids freezing in the winter. They become stiff
with no breathing or heart beat. Then thaw for the spring.
Toad, Bufo cenorus, walkes high up on tiptoe
across snow to get to it's breeding areas.