Not sure if that's the best substrate to use for dragons... i doubt very seriously that it would be outright harmful to them... all it is, is ground up newspaper into a pulp and then baked... but from what I remember it's not very fine...
I would think they babies would have somewhat of a hard time finding crickets in there and walking on it might be a little difficult at times for them. The biggest concern I think would be them trying to find the food.
Best to maybe keep them on white paper towels or paper until they are a lil older I think... but that's just my opinion. If it works for you great, let me know. I used to use CareFresh for my snakes, but I don't think it's gonna work great for dragons.
let me know,
brandon
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Dragons by Nature