brown frog; reddish-brown frog (Ranidae)
General term for any brown or reddish-brown frog of the family Ranidae, often used in field guides or casual observation.
I found a brown frog in the rice paddy.
Japanese brown frog (Rana japonica)
Specifically refers to the species Rana japonica, a common frog in Japan. Often called ニホンアカガエル in scientific contexts.
See also: ニホンアカガエル
The Japanese brown frog is distributed from Honshu to Kyushu.
Japanese brown frog; Rana japonica
Ezo brown frog; Hokkaidō frog
Katakana spelling is common for this animal name; usually written in kana.
Kanji spelling, less common than kana; may be encountered in older or formal texts.
Mixed kanji-katakana spelling, also used.
Compound of 赤 (aka, 'red') and 蛙 (kaeru, 'frog'), referring to the reddish-brown coloration of these frogs.