This picture book creates a distinctive, confident child character according to children's unique language and perspective. It overlaps fantasy with reality, and presents the characteristics of children as well as the fun of childhood. In the story, the boy and the frog compare their limb movements such as squatting, jumping and shouting, and describe their body parts such as eyes, mouths and bellies. It subtly blends children's sensory experiences and games into the plot, so that the child characters'characteristics are more and more concrete and solid with the progress of the story. The presentation of illustration is brilliant, including the styles and expressions of characters, the composition, the rhythm and continuity between pages, and the details such as the title page design and the frog pattern on the child's clothes. These display a mature visual narrative and communication abilities. The visual focus fully conveys the concept of children and humor. The text and image have wonderful collaboration. The story begins from the realistic world where the boy and his parents are, into the imaginative world of the boy and the frog, and then to the wonder world of the frog kingdom, and sequentially reversed eventually. If the turning point is more natural and smooth, and the word layout is less confusing, the overall effect would be even better. This seemingly simple yet enriched picture book has surprising and impressive control of childhood and withstands repeated reading and appreciation.