Cook tater tots according to package instructions. Add melted butter and Italian seasoning to a large bowl and mix together. Add cooked tots and toss into melted herb butter.
Preheat oven to 350 degrees. Lay buttery cooked tots onto baking sheet lined with parchment paper.
Sprinkle Parmesan cheese over the tots. Sprinkle shredded mozzarella cheese and mini pepperoni over the cooked tater tots. Bake in preheated oven for 8 minutes, or until cheese is completely melted. Remove from oven. Serve immediately with marinara sauce.