How can you tell the difference between a male and female frog externally?

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...

A female has larger breasts and no penis. A male has a penis and smaller breasts.

Human Beings The difference is that the boy has a penis and an Adams Apple. Girls have no Adams apple and when going through puberty girls get a period for which they have to use tampons or pads.

That depends entirely on the species.

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