If you like hot and spicy food, here's an Asian style recipe I use for chicken wings (won a contest with it once). I've only tried it with frog legs once, but it was really good.
1/2 cup Sriracha chili sauce (available from asian markets and some larger grocery stores)
3 tbsp. soy sauce
2 lg. minced cloves of garlic
2 tbsp. red pepper flakes
1/2 tsp. cayenne pepper
1/2 tsp. black pepper
1/2 cup brown sugar
Dash of sesame oil
A pinch of ginger powder
Mix together and marinate 2-3 lbs. pounds of frog legs or chicken wings in it overnight. Toss on a grill over medium coals and fragrant wood chunks (I like hickory or fruit wood). Dab the leftover marinade on top when you put them on, and once again when you turn them. If the grill has a cover, use it to keep the smoke in. Turn them over after about 10 minutes.
Since I use the lid on my grill, the tops brown from radiant heat and that's my indicator of when they're finished. I turn them about halfway through and when the sauce turns from red, to golden with brown bits, they're done. Usually about 20-22 minutes, depending on the heat. You need to watch closely though, as they tend to burn easily because of the chili.