Slice tofu block in half lengthwise. Cut each half into 1/3-inch slices to make bite-sized 'nuggets.' Place tofu in resealable plastic bags and freeze until firm and dry, at least 24 hours.
Preheat the oven to 350 degrees F (175 degrees C).
Place tofu slices on a microwave-safe plate. Heat in the microwave until defrosted, 2 to 5 minutes. Squeeze out water from the tofu and place slices over 3 layers of paper towels to drain. Pat dry with additional paper towels.
Mix ranch dressing, hot sauce, sugar, and black pepper together in a bowl. Pour bread crumbs into a separate bowl. Coat tofu slices with the ranch mixture and roll in bread crumbs until thoroughly coated.
Bake in the preheated oven until tofu nuggets are golden brown, 20 to 25 minutes.