Frames are collectible items with which you can decorate your profile picture or avatar. You can obtain them by completing themed missions, answering question topics both in Mountain Track and in Toad Kingdom.
Every time you land on a square containing a question mark (?), you will be able to answer a question on a specific topic. Each topic will be a themed Mission; the objective is for you to complete the mission progress bar to get the corresponding frame.
In the "Inventory" section, represented by a backpack icon in the bottom bar of the screen, you will be able to find your collection of Frames and also equip the one you want, as long as you have already completed the corresponding mission to obtain it. You will also be able to see which are those frames that can be exchanged for gems.
In the “Missions” section, in the “Themed” tab, you will be able to see the missions in progress and what you need to complete them.