Preheat oven to 425 degrees F.
Place frozen sweet potato fries on a baking tray as instructed on the package.
Place garlic cloves with their skin on in a piece of foil and coat with oil (about 1 tbsp).
Wrap the garlic cloves in the foil and place in the oven along with the sweet potato fries.
After 15 minutes remove foil pack and let the garlic cool. Continue baking the sweet potato fries.
Squeeze the roasted garlic cloves out of the skin.
Blend together yogurt, roasted garlic, oregano, and lemon juice until smooth. Season with salt.
Remove the fries from the oven once they are finished baking.
Load up sweet potato fries with all of the prepared toppings! Drizzle with garlic yogurt sauce.
For an extra kick you can marinate the crumbled feta in olive oil, crushed red pepper flakes, and oregano.