Does your ABG mix have any fertilizer?? Fertilizer and frogs don't mix. As long as its just a mix of dirt I don't see why not. If you're making your own (which I would think would be preferable because you could control what goes in it), make sure all of the parts are finely ground/milled enough so as not to cause impaction risk. (If the frog ingests any while going for a cricket for example)