Mix sweet potatoes and carrots together in a large bowl. Form into small balls and flatten into patties.
Heat oil in a large skillet over medium-high heat. Fry patties in hot oil until golden brown, about 1 minute per side. Drain on paper towels; allow to cool slightly, about 5 minutes. Season with salt and pepper.
We have determined the nutritional value of oil for frying based on a retention value of 10% after cooking. Amount will vary depending on cooking time and temperature, ingredient density, and specific type of oil used.