If it's working, then I guess it's working... But nightcrawlers and insects such as crickets or dubia roaches are definitely easier to digest. These frogs would never get seafood in the wild, and it's a completely unnatural food source, and with feeding frogs in the summer you run a huge risk of parasites.
My honest opinion of this is that you might have a healthy frog for a year or two, but that it's not a good long-term diet. There's a difference between what's best for the frog and something that just isn't bad enough to kill it.
Also, I know they eat frogs in the wild, but like my vet said when he was talking about letting dogs chew bones "Coyotes chew bones all the time in the wild, but no one hears about it when the coyote has a perforated intestine because of it". I see feeding pacs wild-caught frogs as about the same way.