How could the environment be affected with the removal of frogs?

The most likely scenario for the evolution of all amphibia, vertebrate animals who live partly in and partly outside the water, is the following:

At some time, all vertebrates were aquatic animals, spending all of their lives submerged in water. A combination of competition, scarcity of resources and predation would have caused groups of vertebrates to adapt first to seeking out ever shallower waters, and eventually even venturing out of the waters for periods of time

• for instance for mating, reproducing or food gathering. Thus

ambhibia would have evolved.

Some subset of these early amphibia would then have adapted even further, spending more and more time on land, eventually leaving the water altogether. From these groups have evolved all modern land-dwelling vertebrates.