I’ve kept my fair share of leopard frogs. Since they are strong jumpers, they should be kept in the largest enclosure possible. Although they are at home in or around water, they aren’t really aquatic, so the enclosure should be mostly land. A four inch deep water dish sounds ideal. Change the water frequently.
My preferred substrate would be a mix of topsoil and coconut fiber, with a layer of leaf litter on top. I like plants that are easy to grow- pothos, wandering Jew, philodendron, spider plants, etc. An LED plant light would suffice. Unless you keep your house unreasonably cold, supplemental heating is unnecessary, and possibly detrimental to this species.
Food can be any small, live invertebrate that will fit in its mouth.