noun
Japanese tree frog
Refers to the species Hyla japonica, a small green frog common in Japan. Often seen in gardens and rice paddies during the rainy season.
梅雨の時期になると、庭でニホンアマガエルが鳴き始める。
When the rainy season comes, Japanese tree frogs start croaking in the garden.
ニホンアマガエルは、葉の上でじっとしていることが多い。
Japanese tree frogs often sit still on leaves.
アマガエル is the general term for tree frogs; ニホンアマガエル specifies the Japanese species.
Compound of 日本 (Nihon, 'Japan') and 雨蛙 (amagaeru, 'tree frog', literally 'rain frog'), referring to the Japanese species of tree frog.