"Isn't it perfectly reasonable that a human who found a large tooth would dream up dragons?"
One of the strange things I found about dragons, is there is more to the legends than typically assumed. From about 1500 and earlier, there are direct witnesses which often read like: "on the 13th of May, Hans of Lieder was walking the road to Liederhaus at about noon and saw a large dragon dead in a field. He...." Such stories (history?) are more widespread, specific (date, time and witness) and universal than most realize. They don't read exactly like legends--unless of course you assume a priori they are impossible. The idea that dragons and dinosaurs are the same actually makes a lot of sense...unless you insist on having an evolutionary perspective.
Even so, you have to admit that Farah makes some pretty extraordinary claims here.