Like filled with water or air. I take it air. Get something to monitor heat and humidity. Days temps should be around 82ish with a 4 or 5 degree temp drop at night. These frogs will change color as they age. Your pics are comming up broken. Try not to spray him directly. If he is readily eating and pooping I would say no worries. Would avoid the mealworms too, they could cause impaction. If you see the frog repeatedly open his mouth while kinda wiggling he is shedding, which is a cool process to watch.