Slice your watermelon into thin rounds (about 1/4 inch thick) and then use a crinkle cutter to cut the watermelon into french fry shapes. Make sure to remove the rind.
Add the yogurt and whipped topping to a mixing bowl and whisk together until combined.
Plate the watermelon fries, sprinkle on a little sea salt (if using) and serve with the dip. Enjoy!