The Dropbox API doesn't offer a way to list/download files based on a particular prefix like this. You could use /2/files/list_folder[/continue] to list files and folders, filter the result to the desired files, and then download them using /2/files/download though.
We love to learn from the educators who use Dropbox. Whether you teach kids, teens, adults or a combination of all three, we want to know what apps and integrations you use with Dropbox to help with teaching. Which of the ones below is your favorite, or most used tool?