There have been many attempts to make this right, but it seems that everyone has failed until now. Or at least claims the inventor of the pepperoni pizza with french fries dough, who says that everyone else has failed to make the french fries base correctly:
I've see many variations of the french fry pizza combo, but none that actually looked like a pizza. Using cheese as a glue to hold the fries together I was able to create a crust and build a pizza on top of it.
The key of the crust is to cook it separately, using cheese as a glue:
As soon as French fries are cool to the touch line a 12" skillet or a pizza pan with the French Fries. Using the sides of the skillet or the edge of the pizza pan as a guide make a circular crust with the fries in a single layer. Fill in and holes with additional fries. Don't be afraid to break the fries into smaller pieces to fill in the gaps. A nice even layer of fries is what you are looking for.
Take 1 cup of the shredded mozzarella and sprinkle in an even layer across the French fries. The cheese will act as glue, keeping your "crust" together. So be liberal with the cheese and make sure there is some covering the entire pizza in a single layer and in all the nooks and crannies. Place in 400 degree F oven for 5 minutes.
It's probably gross, but I want it in my mouth now.