If memory serves (which is old), you are out of luck in this regard. WotC didn't put out any products that detailed racial classes. The closest you would have seen would have been paragon or bloodlines out of the Unearthed Arcana. That, of course, is dis-including the Savage Species book.
Speaking to other publishers though, I don't recall anything in what I saw that did racial classes either. Necromancers of the Northwest has done a few articles covering this on their website, in recent times, but I don't recall if the lizardman was any part of those.