Hmm, you know what, I didn't read it carefully the first time and it seems a bit odd that they're still so small.
It sounds like they're too small for dubia roaches and some people say their tree frogs don't like them (mine love 'em but I mostly hand feed), but there's smaller alternatives to dubia roaches that are just as nutritious.Turkestan roaches, lobster roaches, green banana roaches, fulvescent wood roaches etc.