Welcome to the forum riles! It looks like a Cranwelli to me, too. Depending on how big your frog is the pooping frequency changes according to age. The younger the animal, like Evolution said, poops once every 3~4 days, and adults may poop once a week or longer, while your frog now might sit anywhere between those two age groups.

I'm getting a little worked up with Petsmart from your description of their captive conditions. The closest large pet chain store (14 miles) to me is a Petco and although not perfect, the way they keep their animals are surprisingly acceptable, at least for pacman frogs, the substrate is always EcoEarth, their food is always crickets, a hideout, and they're also provided with a small water dish. However, they do mislabel their Cranwelli as the ornate horned frog.

The only Petsmart I've been to was near San Francisco and surprisingly they do not have any live herp animals, now that I realize it's a GREAT thing that they don't, but I was impressed by their reptile/amphibian supplies aisle as they have a reasonable selection of terrariums, lights, supplement, etc. Petco in comparison has virtually nothing to offer in their herps section.

Do me a favor, if you have the address of that Petsmart send it to me and I will call them to inform about the correct way of keeping their Ceratophrys. This is to their benefit, too, because they don't want to have dead frogs returned to them.

In case the little guy you have might still got some colorful pebbles in its belly, i would recommend feeding pieces (of the length between the eyes of your frog) of large Canadian nightcrawlers (undyed), because earthworms can act as a poop softener and may aide in pushing those hazardous objects out of it's digestive tracks.