We have a very large bullfrog that lives in our outside pond. His sound is very deep and bass-like. For the past 2 nights, we've been hearing what we thought was locusts or some type of bug. Tonight it was so annoying, I took out the flashlight, and found 2 much smaller frogs or toads on the pond calling out to each other it seemed. Very annoying sound and very loud. These don't look like bullfrogs.........they are smaller, brownish, and they have a black looking throat that pops out when they whistled. What are they? And what are they doing?

