Muggle fairy tales on frogs into princes or princess

"And while I understand that you've distracted by the prospect of choosing your dates to the Celestial Ball... There will be no transfiguring frogs into princes or princesses today, as described in Muggle fairy tales."

- Minerva McGonagall urging students to focus in class

In the Muggle world, there were a number of fairy tales depicting frogs into princes or princesses.

During the 1987–1988 school year, due to the excitement for the Celestial Ball, Minerva McGonagall referenced those fairy tales in her fourth year Transfiguration class, asking students to pay attention.

Behind the scenes

 * In the real world, there are a lot fairy tales fitting this depictions, notably ' and ', respectively of German and Russian origin, with the latter also having notable Italian and Greek variants.