Suspect your frog is suffering from CA deficiency which has brought Metabolic Bone Disease. Feeding CA or vitamins to crickets will never equal dusting them with appropriate supplements. Recommend get some Repashy or RepCal products and use them according to following schedules: http://www.frogforum.net/food-feeder...schedules.html. Placing dusted crickets in a semi buried glass bowl will help keep dust on them. Also; recommend add not dyed night crawlers (from Walmart or local bait shop) as main staple to their diet.

I'm not sure from answers if you have a divided tank with wet/dry sections or a tank with dry substrate and a water dish. If the later; dish needs to be cleaned and refilled daily. Leopard frogs are mostly aquatic and will spend majority of the time in water. They really need a split tank set-up; maybe 60/40 wet to dry ratio. A cycled filter in wet area will help remove toxins from water like Ammonia and Nitrites. A 25% weekly water change together with filter will keep water side OK for frogs.

Substrate should be shredded coco or if using live plants, ABG type soil. Coco bark pieces can lead to impaction and more problems. Here is also a care article for your frogs: Frog Forum - Leopard Frog Care - Rana pipiens (Schreber, 1782) and R. sphenocephala (1886). Good luck !