From Webkinz Insider Wiki
The Groundhog Leprechaun has made two appearances in Webkinz World.
First, as a Webkinz Studio Actor. He was sold as a seasonal item for St. Patrick's Day in the Ganz eStore in March 2010.
Then, he showed up as a Clubhouse Clicker in March 2010, passing out rainbow colored coins.
The event was known as Catch the Leprechaun 2010.