"Frog populations" refers to the number of frogs living in a particular area or region. It simply describes how many frogs are present in that specific place. Full definition
Similarly, they found higher than average rainfall in areas that typically experience lower annual rainfall saw positive effects on wood frog population growth. (sciencedaily.com)
The discovery sheds new light on some of the threats facing fragile frog populations, which are in decline worldwide. (sciencedaily.com)
In those days the pond had a viable frog population. (newscientist.com)