After starting it, I completely missed out on all this lol, but did want to say: I did think of Leaf Dragon (and even Dragonfly!) before posting, it's just that
Leaf Dragon sounds small-ish, and Dragonfly for obvious reasons, whilst Double-headed Dragon still sounded
big. That was my point really, Juvenile Dragon or similar would've been my suggestion, but sounds like you've found a good answer anyway