Fill a deep pot with 1/3 oil and heat to 350 degrees.
Add the fries in batches and fry until hot and golden brown, about 3 minutes.
Drain and transfer into a clean stainless steel bowl.
Season immediately with kosher salt, to taste.
Place about half of the fries on a plate and top with 1 ounce of the cheese sauce.
Arrange the remaining fries in a tall pile. Drizzle the remaining cheese sauce evenly over the fries. Top with the bacon. Drizzle the ranch dressing in a criss-cross pattern over the fries. Scatter the chopped scallion over the fries.