As you travel from Kingdom to Kingdom, there will be a number of different Souvenirs that Mario and Cappy can purchase of the Odyssey Airship. In order to obtain said Souvenirs, all you must do is find and obtain Purple Coins, and then purchase the Souvenirs for that given kingdom's Crazy Cap Store. There are a total of ten different Souvenirs you collect: Plush Frog (Cap Kingdom), Bonneton Tower Model (Cap Kingdom), Triceratops Trophy (Cascade Kingdom), T-Rex Model (Cascade Kingdom), Jaxi Statue (Sand Kingdom), Pyramid Model (Sand Kingdom), Rubber Dorrie (Lake Kingdom), Underwater Dome (Lake Kingdom), Flowers From Steam Gardens (Wooded Kingdom), and Steam Gardener Watering Can (Wooded Kingdom).