Louis Moe & Georg Kalkar's children's book from 1920, about the frog Peter Croak, who is a swimming teacher, and the mice who are envious of his success.
Authors: Louis Moe & Georg Kalkar Translator: Lea Thume Publication year: 2020 (1st Danish edition: 1920) Original language: Danish ISBN: 978-87-93588-19-6 (pdf)