A small, green European frog, Rana lessonae, with dark brown or black blotches and (often) a light dorsal stripe, and a distinctive loud quack-like call in the mating season.
Origin
1970s.
Definition of pool frog in US English:
pool frog
noun
A small, green European frog, Rana lessonae, with dark brown or black blotches and (often) a light dorsal stripe, and a distinctive loud quack-like call in the mating season.