If it's legal to collect them in PA, drive around on warm and rainy spring nights with your windows cracked listening for their call to find breeding grounds. Return in the day and gather a few eggs or tadpoles a few days later. Collecting little ones will have less impact than pulling breeding adults out of the population, something like 1-2% of eggs even make it to the land stage, a few eggs or tadpoles won't be missed nearly as much.

Most provinces and state laws I've looked at end up with 3 or 4 groupings for wildlife, each with it's own set of what you're allowed to do with them (no restrictions, limits of possession with fishing liscence, ok to own but not to buy/sell/import, strict hands off, etc.). A species ends up in whatever category people thought made sense at the time to be re-evaluated usually... never. Or when someone decides a pet frog could destroy civilization. So it doesn't always have to make sense. Strong protection laws for wild frogs can be a good thing, it discourages people from collecting hordes of the little ones to be sold as live fishing bait for example.

You could also try selling off some of your roaches, they're pretty desirable as feeders. Or so I hear, they're not legal to keep up here in Canada.