Do you think it might be lard?
The last ingredients list that I saw for the Giordano's dough was at Reply 23 at http://www.pizzamaking.com/forum/index.php/topic,5674.msg51855.html#msg51855
. That was in 2008. As you know, Giordano's later filed for bankruptcy so anything could have happened to the dough once they worked their way out of bankruptcy. Giordano's has never publicly posted Nutrition Facts for their pizzas and, even if they did, it would be very difficult to reverse engineer and clone their pizzas from the Nutrition Facts because there are too many moving parts.
A member who was privy to one of the very early Giordano's doughs (circa
1974-1975) once shared the recipe with me. That recipe included margarine and vegetable oil, in surprisingly small amounts (total combined fat), but no lard. Lard is frowned upon these days so it is not surprising that Giordano's went to vegetable oil.