Chocolate Frogs are a form of sweets in the wizarding world. They are hollow and contain a Famous Wizard card. These cards make Chocolate Frogs very popular, and many children collect them (PS6).
In the Harry Potter movies, Chocolate Frogs are enchanted to act like real frogs; however, this characteristic is not mentioned anywhere in the books.
"Chocolate Frog" is one of the incorrect password guesses Harry makes when he wants to get into Dumbledore's office after he has a vision of Lord Voldemort at the end of his fourth year (GF29).
This article has to be revised (see hidden notes).