Hi and welcome to the forum
Frogs and fish should not be kept together. Frogs eat small fish, snails and shrimp.
If the fish get sick, the medication used to treat them usually kills the frog.
Frogs should have sand on the bottom of the tank so if they swallow it, then it won't block up their intestine. Bigger gravel can cause problems.
Cycle the aquarium to get the beneficial filter bacteria growing before adding fish or frogs. It normally takes around 4-6 weeks (sometimes longer) to cycle the tank. If you don't want to cycle the tank first, add a heap of live aquatic plants and let them grow for a few weeks before adding fish or frogs.
Use an air operated sponge filter or a power filter with a sponge on the intake. Frogs don't normally come from fast flowing water and can be injured if they get sucked into a power filter.
Feed them a variety of frozen foods like brineshrimp, daphnia, bloodworms, etc.