No idea about a Big Horn, but I suspect they don't. The Laramie comes with your choice of carpeted or rubber mats at no extra charge. The fact that the Big Horn has the rubber mats as a $135 option tells me it probably doesn't have floor mats. But I'd just ask about that at the dealership, and try to get them to throw the floor mats in at no charge (in writing) when negotiating price.
Edit: After taking a look, I see the 2021's have the same $135 price for the rubber floor mats. They were included with my Laramie, but maybe they came with the ORG? Sorry, didn't mean to give you the wrong information.