Well the nutty lizard ate a rock a little smaller than the usual excrement but around .5in long. It was basically smooth. The dragon is about 18 inches. Do you think he will be ok?
I'm sure he'll be fine, don't worry. Keep an eye on him, maybe bath him more than you usually would since they tend to poo most of the time when they take one. It's not uncommon for them for them to sometimes eat something they shouldn't.