You have to dust even if you have gut loaded the crickets. You even need do dust upto every feed with young frogs as they need a lot of calcium, which in the wild they would receive from eating a wide variety of prey, probably more like other frogs or small reptiles, mammals or fish, rather than crickets. I use Repashy's Calcium Plus which has been designed to use at every single feed as it has a more balanced vitamin content.