Don't want you to think that we are not seeing your post, just thinking about it first. I bet Larry has more experience then I do for sure, so perhaps he is also thinking about it.
I personally have never seen frog leg trailers, but I can see a use for them. I also have never seen Frog scent. I can see a use for it as well, and now that you mention it, I wonder why there is none sold.
I cannot help you on the scent, but I can offer suggestions for a jig trailer. Larry's Dahlberg's Diver Frog has an excellent replacement leg that would be perfect for this. Additionally, you take the legs, modify them, and make a mold to pour your own version.
http://www.river2seausa.com/topwater/48 ... -frog.html