This series is part of Scholastic's early reader line, Acorn, aimed at children who are learning to read. With easy-to-read text, a short-story format, plenty of humor, and full-colour artwork on every page, these books will boost reading confidence and fluency. Acorn books plant a love of reading and help readers grow! Meet Crabby. This crab is a little bit grumpy, a little bit bored, and just plain crabby! Plankton tries again and again to cheer Crabby up - with laugh-out-loud results! Author: Jonathan Fenske. Paperback. 4+ years.