Frogs are both great escape artists and great at hiding. If you have plants like bromeliads, they will slide down in between the leaves and back up until completely covered. They also dog down into substrate to get to some moisture and hide.

If you fear it has escaped, put some water dishes around the room and house. They travel far and fast. Also look for unusual things such as dust bunnies pulled out or trailing across a section of floor. I had a paor of Whites investigate every room in my house in one night, pulling dust bunnies out of every room, and leaving a trail down the steps and to the living room. They both came out when they heard us looking and were in pitiful condition.

Good luck finding him.