The tiniest frogs, peeper type, are the loudest IMO. They usually gather in large numbers, too, so maybe that's why. Frogs in nature are loud, and not sure neighbors would have any say in whether you got to keep them or not.

As stated above, they are all noisy when it's mating time, this time of year. If you are trying to introduce frogs into your pond, maybe go to local ponds and see what frogs are there, and catch a few. Might be more successful in keeping them in your pond. You can't keep a tree frog if you don't have trees, same with any other frog that your yard doesn't have the proper environment for. But, then, in my yard, all the frogs come visiting me, I have not had to add anything.

Good luck!