7 large? Crickets a week doesn't seem too few. If they're smaller than large, I'd up the amount and see how well he eats. Certainly doesn't look underfed though. One tip, I'd get branches to make use of all that vertical space. Once you do that, he will probably never touch the ground.

I agree with Paul, would not add more than one to that size tank.

My male grey tree frog regularly chirps in response to the vacuum cleaner, my daughter's violin, etc. It's normal.