If your frog is still alive he's probably looking for moisture if he hasn't already found some.

Does your basement have a sump pump? Many animals will take refuge in the reservoir of water that a sump pump sits in. If there's any other places in your house that stay damp or wet make sure you check those areas thoroughly!

Heat is helpful, but moisture is your frog's #1 priority right now!

You should also check the soil of any potted plants in the house.

Look in bathrooms, under the lip of the toilet seat, in the corners of the shower, under and around the sink.

Look by your water heater and by your air conditioner, but of which could provide heat and moisture.

I've had some frogs escape it make it back to their tanks mostly unharmed, others have met a gruseome fate of being covered in dust and drying out under a piece of furniture

I wish you the best of luck!!!