I recently have been wanting to start harvesting frogs, afterall there are more than 1000 miles of navigable waterways within 1.5 hours all around me, in the heart of the Delta. That doesn't even count the ditches, irrigation, ponds and backwaters. The native specie has been driven to near extinction by over harvesting during the gold rush and later by the invasive Bull frog.
Yes, there is a reason you see only one or two bigguns per waterway, they are the dominant male. They can and do eat anything that fits in their mouth, including other bulls.
What poundage are you shooting? I see a perfectly good reason to build a seperate board bow for froggin! Oh, no season or limit on American Bullfrogs here, and almost no restrictions. Just can't have any way to destroy habitat to unearth amphibians (move logs, smash rocks, dig up burrows, etc.).