“Chorus” is one of the more solidly documented collective nouns on this site, borrowed directly from actual scientific terminology. Herpetologists use “chorusing” as the standard term for the coordinated calling behavior of male frogs during breeding season, when dozens or even hundreds of males gather at a pond or wetland and call simultaneously to attract females.
The calling itself is more sophisticated than it sounds. In a mixed-species pond, each species has a distinct call, which lets females home in on the right mate despite the surrounding noise. Within a single species, males often alternate or stagger their calls rather than calling in a random jumble, a pattern researchers believe helps females distinguish and compare individual males rather than hearing one blended wall of sound. Some species even show call synchrony, timing their calls to overlap in ways that may help the group’s combined sound carry further, though it comes with a tradeoff: a loud chorus is great for attracting mates but also easier for predators to find.
Frog choruses have become genuinely useful beyond mating, too. Bioacoustic monitoring, recording pond choruses and analyzing them for species presence and population health, is now a standard, non-invasive tool for tracking amphibian populations, since a chorus can reveal what species are present in a wetland far faster than visual surveys alone.
Example: “A chorus of frogs rose up from the pond the moment the sun went down.”
Related: Collective Nouns for Amphibians · What Is a Group of Frogs Called?