Allow to marinate (soak) for at least 4 hours (overnight is really good).
Add oil to your frying pot and heat to 350°F. In a large bowl add the flour, onion powder, garlic powder, Creole Seasoning and black pepper and mix with a whisk.
Once they have cooled completely, store in an airtight container (with a little paper towel) in the refrigerator for up to 3 days. Reheat using the oven or air fryer for best results.
Notes
Soaking the frog legs really helps soften the meat before frying. If you can't get the injectable marinade then milk or buttermilk is a good alternative.