My son received a planet frog setup with a pair of leopard tadpoles.

It's been 5 months and no change.

Can I put these guys in a large fresh water fish aquarium with small fish until see some development?

Leopard frogs may take a year to go from egg to land adult. If they're still in the tiny Planet Frog thing, they're probably stunted. What are you feeding them? If you move them to a larger tank and feed things like fish food flakes, algae, kale, sinking algae wafers, etc., they should grow a little faster. Also, keep the water very clean, filtered, and heated to about 70-75 degrees F. Be sure any fish you keep with them are too small to eat or pester the tadpoles. I hope you have a pond or terrarium where they tadpoles can go when they turn into adults. Slowly lowering the water level can often enduce tadpoles to develop their legs. If kept in deep water, they may stay tadpoles almost indefinitely. I assume that if they're in the Planet Frog thing, then it's certainly not deep water in there though. Good luck!

I once had a Leopard frogs. Those things do not take long to change. Mines change from a tadpole to a frog in a week.My Leopard frogs only ate moving foods

Thanks

I'm feeding them the stuff they came with. Water changes weekly with bottled stuff.

I'm considering putting them in a 55 gallon with small fish until I see some development.

Any thoughts on that? They'd eat better.

I have a neighbor with a pond I can move them to in the spring....if they grow.

The food they came with is probably not very good. They need variety too. Bottled water is not required if your tap water is okay (and dechlorinator added). I think they may do better in the fish tank.