Rinse frog legs and pat dry.
In a bowl, combine sugar, salt, garlic powder and pepper. Toss frog legs in mixture to fully coat and marinate for about 30 minutes.
Dip frog legs in beaten egg then toss in corn starch until completely coated, shaking off excess.
In a skillet, heat about 1 inch of oil over medium heat. Fry frog legs, turning once or twice, for about 4 to 6 minutes or until golden brown and cooked through. Remove from pan and drain on paper towels. To serve, pour garlic butter sauce over frog legs.