Cold Toads

Here's my biology meets physics question for folks.
When a boy frog wants to Gribbet for a girl frog, he finds the coldest spot in
the pond to gribbet from.

Why?

Does it have anything at all to do with shrinkage?

Rein

Ahem.
Why no - and wouldn't that make the poor Mr Toad want to AVOID the cold?
But thanks for trying :>

It's always nice to contribute something of value. ;-) How about a
game? Just send one over if you want!

Rein

I think it goes something like this: to attract the females, a male wants to have as deep a
voice as possible so he sounds big and tough. Now cold air is denser than hot air, so it would
lower the pitch of his voice (witness the effects of a person inhaling helium for the opposite!).
Therefore the frog tries to find the coldest air he can to ribbet in. Why don't people get
lower-pitched in winter? Because what matters is the air around the vocal cords, which stays
at roughly the same temperature since we are warm-blooded. But a cold-blooded frog uses
its environment to manipulate its body temperature, so can pull of this trick with relative
ease.

Bingo! You are a wise man indeed!
Of course my voice usually gets deeper in winter, but that's because of
bronchitis...