For what purpose -- to what end? The more experienced are weighing in here and suggesting that there is no reason conceivable that a premed about to start med school should even find such info remotely useful if it actually existed. Do well in med school, particularly on Step 1 and the clinical years, and that will pave the road to a desirable residency. When you get there you can decide on the next step, not before.
Anyway we answered the question -- there isn't "a" single match for fellowships, many fellowships won't even be through the ACGME, and so your ability to find a single publication, clearinghouse or chart is nonexistent. There will not even be something that encompasses a large percentage of fellows, it's all too inhomogeneous. We aren't hiding the ball, the ball doesn't exist. Each residency you interview at can give you an idea of where people went for fellowship, and if you are interested in an academic or subspecialty path that's always a good line of inquiry in residency interviews. But not so much before. There's nothing to do to enhance fellowship prospects at this time that isn't something you already should be doing in med school for residency purposes.