You can get the spinner bait skirts at most retailers. Just make the overhand knot in the middle and you should be good to go, the frog will hold the skirt material because it is a tight fit.
To prevent this problem, a lot of the pro's are using baby powder to store their frogs in. Just coat the legs and store them in the box, it absorbs the water and keeps the legs from sticking together. I have done this and it seems to work well. The powder comes off when you make the first cast.
