This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Tugarin Zmeyevich (Slavic)
Tugarin, although spoken of as a dragon, largely retains an "anthropomorphic" form, and is seen riding a horse. It appears he has wings with which to fly, and he soars to the air during the duel with Alyosha. The flying wings are certainly a dragon-like trait, but some versions explain it away as a contraption made of paper, attached to his horse and not to himself.
Tugarin was a great glutton, which is somewhat of a dragon-like trait. He could stuff a whole wheel of bread in each cheek, then deposit a whole swan on his tongue and swallow it. This is similarly but somewhat differently sung in some versions of bylinas. He had a huge head, and in some texts, his severed head rolled off like a beer cauldron, or it rolled off like an onion, later to be described as big enough to serve as a cauldron.