By the pics it doesn't look too big but the head seems smaller than a guys, a bit more pointy and there's a stripe down the back but I may be wrong. Either way, a lovely frog.

I'd do it now. Maybe the frog had some trapped air as well.

Thats a little too chilly and too cold can cause problems and disease. If you just got a higher wattage basking light it would sort the problem. Humidity is not too much concern aslong as you mist frequently, don't allow the substrate too dry and there's a water dish available.