Has anyone ever kept green frogs (Rana clamitans)?

If so we'd love to hear tips and suggestions. The girlfriend is quite interested in keeping a little 3/4''er that we caught at the river.

For the moment we're just going to use a dart-frog friendly substrate and submerge a large tupperware into the substrate to provide a substantial water feature, along with some various stuff to provide security and hiding spots. I just hope we can get the guy feeding