A tree frog is any frog that spends a major portion of its lifespan in trees, known as an arboreal state.

The Japanese tree frog (Hyla japonica) is a species of tree frog distributed from Hokkaido to Yakushima in Japan and from Korea along the Ussuri River to northeastern China, northern Mongolia, and the southern Russian Far East.

These tree frogs are commonly found in rice paddies, and rest during the day on rice leaves and other broad-leaved vegetation. Origami designer Satoshi Samiya probably designed this while listening to the sound of “kero kero”