Preheat oven to 400 degrees F.
Cut head of garlic to expose the top. Drizzle 1 tablespoon olive oil and season with salt and pepper. Wrap garlic in alunimum foil and place on a baking sheet. Roast for 35-40 minutes or until tender. Remove from heat and let cool slightly. Remove foil and squeeze out garlic cloves.
Increase oven to temperature to 550 degrees. Heat pizza stone if using.
In a medium bowl, add 8 cloves roasted garlic and mash with a fork. Add ricotta, dried oregano and season with salt and pepper. Set aside.
Heat 1 tablespoon oil in a large deep pan over medium heat. Add minced shallot, garlic, and red chili flakes and saute for 1 minute or until softened. Add clams, thyme, and white wine, and cover the pot. Bring to a boil and continue to simmer until clams open, about 5-7 minutes.
Remove clams with a slotted spoon and set aside. Continue to simmer clam juices until reduced by half. Add butter and season with lemon juice, salt, and pepper. Remove from heat and set aside.
When clams are cool enough to touch, remove the meat from the shells. Roughly chop clam meat.
Roll out pizza dough into a 12-inch circle using your hands. Tear mozzarella into smaller pieces and top pizza with 4 ounces of cheese. Place dollops of half of the garlic ricotta on top. Bake pizza for 7-8 minutes or until cheese is lightly charred and crust is golden brown. Repeat with remaining pizza dough, cheese, and garlic ricotta.
Top pizza with cooked clams and drizzle clam sauce on top. Garnish with chopped parsley and serve immediately.