What are the differences between male frogs and female frogs?

Males are sometimes smaller but don't count on the size alone to figure out. Male frogs usually have black markings on their arms. They are also the vocal ones. If you should ever find two frogs...

well this is weired but frogs are both boys and girls at the same time gross right fact some frogs and lay eggs with out a mate

The females are big but the males croak

check under the chin. if brown its male if white its female!

Please provide details on the two or more types of frogs you wish to compare.