It’s bittersweet. The final title of the Rafi and Rosi Coquí series, Rafi and Rosi Menu! and its Spanish version Rafi y Rosi ¡Menú!, will be released September 9. I’m thrilled to launch the book, but I’m saddened to see their adventures end.

It’s been a long ride for these tree frogs, ambassadors of Puerto Rico since 2004, when the first title was published. Each book features three distinct stories centered on a sp...