If they are made out of Twix, I know what hunter you will get!
Did some checking online for some of the commercial hog decoys. Can't tell that they work or not, but the concept seems quite interesting. I like the idea that some decoys are made where they are well balanced on a post and tip back and forth some like they are eating. I think movement would be good. The vids I saw all shows sounders moving in on decoys at feeders. Does that mean the decoys or were the sounders just going to the feeders anyway and the decoys simply didn't scare away the sounders?
With that said, if pigs are so smart and can tell what is what via smell and have good visual recognition capabilities, then I am not sure that decoys are going to be that helpful.