I think William Green has a good shot at the offensive ROY. Typically, rookie RBs have the most success because their position isn't as big an adjustment as the rookie QB's and WR's. They (the RB) has the best chance of putting up good numbers. And you know an OLman or a TE (another tough rookie position) is going to get it.
William Green has a shot because he's probably going to be the starter from the get go. And Butch Davis wants to run alot. Duckett is mired inbetween Warrick Dunn, Jamal Anderson, And Maurice Smith. DeShaun Foster is in Carolina, but so is Lamar Smith. Combine that with the fact that they don't have a Norv Turner steering that offense, Foster likely won't produce the way Tomlinson did. It will be interesting to see how Carolina compares to the 2001 Chargers as they follow up their 1-15 season.
Anyway, those are the only teams with rookie RBs in the mix.