For one thing, toads have dry, warty skin, while frogs have smooth, wet skin. Both toads and frogs are amphibians, and belong to a class of vertebrate animals that includes salamanders. But they differ from salamanders because their bodies are short and lack tails. There are about 2,770 species of toads and frogs, some of them, like the Goliath frog of Africa, weighing as much as five pounds, and the tiny Sminthillus limbalus of Cuba, which is only a half-inch long. Besides toads having dry, warty skin, while frogs have wet, smooth skin, there are other basic differences between them.
Frogs have tiny teeth on both upper and lower jaws, while toads lack any teeth.
Frogs have longer hind legs than toads. So frogs jump, while toads hop. And when it comes to laying their eggs, female toads lay them in long, parallel strings, while female frogs lay their eggs singly, in small or large clumps, on the water surface. Both frogs and toads have voices and make a sound. And both toad and frog will close its mouth and nasal opening and force air from its lungs into the mouth, then force the air back over the vocal chords into the lungs.