I can't tell you too much about the puffers but I bet Adam can.
The Frogs I have Eat mainly shrimp pellets. They will also eat flakes,krill,tubifex worms,12 inch night crawlers,slow moving fish and just about anything else they can fit into their mouth.
Oh yeah, almost forgot. Just like any frog species they will also eat each other if not fed properly.
Here is a link:
http://clawedfrogs.tripod.com/