Bull frog tadpoles are about 4" long about 2/3 is tail.
So if the body was a half dollar it could be a bull frog. In central fla we have pig frogs and bull frogs both get huge.
Also quite a few species of smaller frogs.
They will eat anything they can catch and swallow.
Earthworms, crickets, palmetto bugs, .......
I don't know the right amount but the the more they eat the faster they grow.
We have a bunch of pig frogs and leopard frogs in our pond.
They are fun to watch.