Greenback Town — C.K. Omillin

A boy named Alesdor discovers a penguin is his garden. A penguin! How is that possible? After Alesdor gives Zeppi the penguin his name and a home, the two become best friends and their adventures begin.

Book 4 - Greenback Town
Everything turns topsy-turvy when a wildlife protection officer wants to put Zeppi in the zoo.