Lord of The Rings: Fellowship of The Ring - Fake Foot
When Frodo stops rolling down the snow covered hill, just before the shot of Boromir picking up the ring, the place where Frodo's fake hobbit foot and real leg meet is visible (it's usually covered by his trousers).
The join you mention is not possible, sorry. If you go to the LOTR Official site and Explore the epic, in the Hobbiton section you'll find a Quicktime clip concerning the prothetics created, and the hobbit feet rise no higher than the ankle. The fake feet shown in the clip are actually Frodos, so whatever you've spotted isn't the join!
It might not be the join, but it is something! I happened to pause it in just the right spot and saw both legs clearly. There's a black horizontal line running across both calves, and the lower leg is a slighty different shade than the upper. I think Wood's wearing flesh-colored socks or something. Think: it must be cold on the mountain!
I think the foot prothestetics used on the mountain scene may have been higher than the ankle - to keep the lower leg of the actors warm - or warmer than it would be. So, it could be the join.
A similar slip-up can be seen in the extended edition in the scene where the Hobbits are following Aragorn through the swamp. When Pippin falls, look at his fake foot-you can see it coming off.
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