From the Super Mario Wiki
Château Chanterelle is a location from Paper Mario: Color Splash. The path leading here is unlocked after getting the yellow Mini Paint Star in Sunglow Ridge, and unlocks paths leading to Mondo Woods and Marmalade Valley. The Toad Professor lives here with his pet Chain Chomp, Princess. The spike for the door in Kiwano Temple is found here. The Piggy Bank Thing card can be found here in the barn.
This area consists in the house where the Professor lives and a little barn. He isn't first found here since he went on a walk to Mondo Woods with Princess, but she escaped. Using the Cutout technique and placing the Bone Thing card will cause Princess to return home. After doing so, the Professor will give Mario the Sharp Spike that opens the door in Kiwano Temple.
The orange Mini Paint Star is located above the house and it can be obtained by using a green pipe. The Cutout technique is required to get the green Mini Paint Star; it has to be activated in front of the barn doors.
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