In restaurants where they serve frog's legs, what do they do...

In restaurants where they serve frog's legs, what do they do with the rest of the frog? Do they just throw it away? You never see "frog torsos" on the menu. Is there actually a garbage can full of frog bodies in the alley? I wouldn't want to be a homeless guy looking for an unfinished cheeseburger and open the lid on that