Throat spots always=male?

[frogmike]

I know that a male usually has a darkly spotted throat, but if the spots are faint on adults, does that still mean they are male. The frog that I am questioning has a male shaped snout and is 5" long. It only makes a noise when it doesn't want to be picked up, and that isn't a croak or chirp. It sounds more like a fat guy bending over to pick something up, or being punched in the stomach. It also opens its mouth to make this noise, instead of blowing out its throat skin. I have two confirmed males and I'm trying to start breeding them again this year. If you click the thumbnail, you can see the faint spots on its throat.