Bring a large pot of water to a boil. Add the sweet potatoes and cook for 5 minutes. Drain and rinse with cold water. Shake off any excess water.
Place the sweet potato and onion into a food processor and pulse to break down into smaller pieces. Transfer to a large bowl. Stir in the coconut flour, garlic powder, chili powder, salt, and pepper. Stir well to combine.
Use your hands to shape the potato mixture into small cylinders. Place aside until ready to fry.
Heat the coconut oil in a heavy skillet until hot. Working in batches, add the tater tots to the skillet and fry until golden brown, turning carefully to brown each side. Once crispy, place onto a paper towel-lined plate. Repeat with the remaining sweet potato mixture. Serve warm.