Share this Page Joan Gannij 0 Total Resources 1 Books Books by Joan Gannij 1 Sort by Number of Resources Number of Awards Book Title Year Published Word Count Reading Level: ATOS® Reading Level: Lexile® Add Multiple Titles to Reading List Browse books by Joan Gannij Hidden Hippo by Joan Gannij and Clare Beaton 1 Resource Add to Reading List Share this Book Images courtesy of publishers, organizations, and sometimes their Twitter handles.