I have 4 males housed together without any issues. You should be fine. I'd say your tank (which works out to be 15 gallons) is just barely adequate for 3 of them, less so when they get to adult size. Remember, more room is always recommended. I have mine in a 20 gallon vertical and all they do during the night is climb the sides and nose up against the ceiling, looking for a way out. It also depends on how your vivarium is designed. More branches, ledges and plants filling the airspace inside provides more surface area than a bare tank.
As for the calling, one of my males started "practice calling" at about 3 months out of the water. It sounded like a chicken with laryngitis. That was 2 months ago. Now it has a proper, trilling call and it does so quite often. And yes, they can be triggered by other noise.





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