Is there a connection between frodo and sauron?

[doug*platypus]

Another foil apparent, however, could be Denethor/Theoden.

Just my unenlightened opinion, but I believe that two foils would have to interact with each other. In the book we never see these two even meet, and I question the nature of their relationship (since they have none!) as being that of each other's foil.

As for Gollum, I think that comparisons with Bilbo work better than with Frodo. As for the initial question, is there a connection between Frodo and Sauron? Yes. The One Ring. Are there any further connections? No.