I've got three to four bullfrogs in an outside 35gal pond buried in the ground, with a foot of water but no natural debris or litter at the bottom for them to hibernate to, though living in Florida, USA, the worst winter temps don't reach below thirty-five to forty and that but for a few days tops. I wonder, however, what these frogs will do come autumn and winter since they're free-raoming(the yard has a fence though,) and I don't think there's any natural prey for them where I've raised them since it's just a back yard. There is a lot of shrubbery, however, and lizards.

What to do? Leave them be?