I thought it was a tostada but I guess the cheese makes it look that way?

Nah, its a regular old pizza dough. https://www.seriouseats.com/foolproof-pan-pizza-recipe is the recipe I use for the dough. If you're asking about the yellow on the edge, that's a cheddar crisp that goes all the way around the edge of the crust

I see the noted crispy cheese but there's way more yellow than I'd expect for mozzarella.

The cheddar crisp is the biggest reason I make my pizza in a cast iron skillet. All you have to do is spread shredded cheese around the edge before baking, between the dough and the wall of the skillet. It produces (subjectively) the best pizza crust ever for almost no effort

Under the toppings and sauce! You can see bare pizza crust in the bottom left of the pizza, if you're trying to find it in the picture. If you're asking for the dough recipe, it's a serious eats recipe I linked in another comment reply on this post

The lactase pills don't work for everyone. Ask me how I learned that next, I'm enjoying having my medical experience condescendingly explained to me by some ignorant internet rando.