They are also very nutritious and a better staple than crickets.
I don't know how small the pieces are relative to your frogs but for what it's worth earthworms are a food item that I ignore the 'space between the frogs eyes' rule. I've had no issues feeding worms that are about as long or even longer then the treefrog eating it (SVL). They're soft and easy to digest so impaction from large hard bits is not an issue, they are incapable of harming your frog, and my worm loving Hyla cinerea has absolutely no issues stuffing them down her throat faster than you can even blink.
You could also look into culturing your own earthworms, but most species take long enough to breed that by the time you get a young crop your whites will probably be big enough to take down pretty large worms (iirc your White's were young'uns?). Breeding earthworms might be worth looking into at any rate.