At the main menu, select My NCAA and then select Pennant Collection. At the Pennant Collection screen, Right Thumbstick (for Xbox) to enter the Keyboard Popup screen and then enter the following passwords to unlock the corresponding cheats. If you entered the cheat correctly, you'll see a confirming message onscreen.
Passwords are case-sensitive. A "_"indicates a blank space.

ARK Mascot: Bear_Down
KU Mascot: Rock_Chalk
MINN Mascot: Rah_Rah_Rah
MIZZOU Mascot: Mizzou_Rah
MSU Mascot: Go_Green
NCSU Mascot: Go_Packs
NU Mascot: Go_Cats
UK Mascot: On_On_UK
Wake Mascot: Go_Deacs_Go
WSU Mascot: All_Hail