He doesn’t actually appear in the J.R.R. Tolkien novel, but that isn’t going to keep Peter Jackson and Elijah Wood from putting diminutive but heroic hobbit Frodo Baggins into the two “Hobbit” movies anyway. According to reports, Wood is already in negotiations to reprise his famous role, and TheOneRing.net has further details about how Frodo will appear in the movie.
[spoiler]According to TheOneRing.net, Frodo will appear in bookend scenes within the movies, as he hears the tale of Bilbo Baggins (to be played by Martin Freeman), the central hero of “The Hobbit” movies, as told by Bilbo himself. So it will essentially be an extended cameo, though of course I’m sure it’ll be fun for the actor/director to reunite in a franchise that basically changed both their lives. [/spoiler]
Now the big question is, what’s a Frodo Baggins appearance without Sam (Sean Astin)? The two were practically inseparable in the first three movies, and I dare say, Sam held their storyline together while ol Frodo just looked all glassy eyed and whatnot.