By pipe I meant water pipe and not smoking pipe. At least I think you are talking smoking pipes because I never heard of making water pipes out of corncobs. The piece on the right just reminded me of a half piece of iron water pipe we found out in the yard once because it seems curved in the picture.
Now that you mention water pipe, the piece on the far right looks like part of a pipe from the angle of the photo. Anyway of telling if it was cast iron, or is it too far gone? I know cast iron and ductile iron (a type of cast with a cement lining) were both used for water pipes.