The Jelly Pine Tree is a piece of Decors in Cookie Run Kingdom. This decor piece was from the lunar new year event. You'll find this decor in the Lunar New Year tab of the decor tab when you go to build.
See also: All Buildings
You'll find it here in the decor tab:
It will be on the top row.
You'll need this decor in order complete one of the lucky pouch missions from the lunar new year event. You needed the lucky pouches to get things from Kumiho Cookie in the event tab.