Yes. Reports of Improper Governmental Activity can be made anonymously by calling the University Whistleblower Hotline. However, anonymous reports are often difficult to investigate if the caller has not provided enough information. Also, anonymous callers cannot purport to represent a larger group (e.g., all the employees in a department) when such representation cannot be verified.
Note that a confidential report is not the same thing as an anonymous one, and it is up to you to decide whether or not to make your report anonymously. Be aware that certain types of reports (e.g., those involving workplace conflicts) often cannot be thoroughly investigated unless the University has a way to contact or interview the involved parties. If the person making the report is a percipient witness to the wrongdoing (where independent verification of the allegations is not practical), the person accused may be provided the report of the wrongdoing, in order that he/she has an opportunity to respond.