Is it wild? You might want to treat it for parasites first lol. Or get some cb if you can.
Because they are always in moist conditions, amphibians can have some bad bacteria or parasites in them, yet not show signs because they have evolved living in those conditions and can often deal with it.
I don't think I would feed my guys a frog, but small geckos and lizards are definitely on the menu.
Mourning geckos, viper geckos, anoles, are all good choices. Try to get CB though to avoid the 'nasties' from getting into your cham.