I'm very sorry your male died . Symptoms listed describe a nervous system issue and it also correlates with the use of tap water. Strongly recommend get a plain dechlorinator like Seachem Prime or ExoTerra Aquatize and treat water prior to using in the frog's dish. Also, if you used tap water to mix the substrate with; need to replace it with new substrate mixed with dechlorinated tap.

If frogs refuse nutritious night crawlers and only eat crickets, it's very important you gut load them with lettuce, carrots, and cherios cereal. IRT the female; a 30 minute bath in an electrolyte solution might help her health. You prepare that by mixing 10% unflavored Pedialyte or similar product with 90% 80F dechlorinated tap. Can use a small critter keeper or plastic bowl with holed up top filled to frogs chin depth with solution. Drape towel over container to help frog relax and keep temperature warm. Good luck !