This is Crab by Harriet Evans and Jacqui Lee
This Is Crab is a bright and cheerful interactive picture book with lots of flaps and accompanying actions that make it loads of fun to read together!
Meet Crab. A shy ocean dweller who, with a little encouragement, will take young readers on a journey through his underwater home. Along the way, readers meet Octopus (please forgive Crab for pinching Octopus, he can't help his claws), discover new friends in a coral reef and see Crab finally come out of his shell . . . complete with a new shell underneath.