Frogs do not actually wear sandals, but there is a popular joke answer to this question: frogs wear "open-toad" sandals, a pun on "open-toed" sandals

. In reality, frogs have specialized feet adapted to their environments rather than footwear. For example:

• Aquatic frogs have webbed feet that help them swim efficiently.
• Tree frogs have sticky pads on their toes that allow them to climb smooth surfaces by adhering through surface tension.
• Burrowing frogs have specialized structures like keratinized tubercles (spade-like extensions) to help them dig

Thus, the "sandals" frogs "wear" are really their natural adaptations like webbing or toe pads suited to their lifestyle, rather than actual footwear. The joke answer "open-toad" plays humorously on this idea.