Another feeder that you may try, since you have smaller frogs, is a feeder roach called Blatta Lateralis. (called rusty reds or Turkistan Roach) It is perfect for smaller sized phibs/herps because the adults are just a little bit bigger than crickets. They are pretty dang cheap too. They are also different from dubias because they lay egg cases instead of the live-bearing dubias, and they are known to reproduce fast. If you wish to feed CRICKET sized insects, I believe blatta lateralis are the way to go. They are kept almost exactly like dubia.
Here is some places you can buy them...
Blatta lateralis (Turkestan Roach) - Greg's Exotic Inverts
Blatta lateralis a.k.a Rusty Reds 100 | Aaron Pauling.com
I just bought a culture and cannot wait to get them going!