Pizza Hut’s dough has been frozen for years. You might find a pizza Hut here and there still on thin and pan premix, my store was. But that is a rare find. Pizza Hut’s thin dough isn’t par baked, it is pre sheeted and fits perfectly in the pan once thawed. frozen dough does have it’s perks, the most obvious one is less labor. You don’t have to spend all that time mixing, cutting and sheeting dough. But one of the down sides, especially with their pan dough is if you run out and you don’t have any dough prep done for the next day… that is if you haven’t panned any dough to use for the next day… you’re gonna be out for a while. The thin dough can be thawed pretty quickly in a pinch, but their hand tossed and pan dough take a long time. Papa Johns says they use fresh dough, it could be them that is going to frozen dough.