Chocolate Frogs are, as the name suggests, frogs made of chocolate, and are very popular wizarding sweets. They are each packaged with a collectible card displaying a magical picture and brief biography of a famous witch or wizard of medieval to modern times. Cards named in the "Harry Potter" series include wizards such as Merlin, Dumbledore, Nicholas Flamel and the four founders of Hogwarts. According to a web chat with the author, Harry and his friends are eventually featured on a series of Chocolate Frog cards, with Ron calling it "his finest hour".