Fred is one of the secret characters that can be unlocked in the Big Hero 6 section of Disney Crossy Road! In order to unlock him, all you have to do is unlock the 'Best Friends' set of characters. These characters include Hiro Hamada, Baymax, Go Go Tomago, Wasabi, and Honey Lemon. Once you unlock these characters (in no particular order) you will unlock Fred!
If you know how to unlock any other Disney Crossy Road Secret Characters, make sure to tell us in the comments below!