The Emerald City ducky was the only duck created for The Emerald City Cache, though it was joined by all of the duckies from the series that couldn’t fit in their specific caches.
Ducky Details of Note:
• In the books, the Emerald city isn’t Emerald. Everyone is wearing emerald glasses.
• See the individual gold bricks on the Yellow Brick Road?
• And the individual petals on the Poppies?