I know you only asked for high school and college but my animal mascots were in previous years so I hope you don't mind if I share.

Sherwood Heights Elementary School: Panther - green and black
Centennial Elementary School: Blue Jays - blue and silver
Hamlin Middle School: Loggers - They have since changed colours to green and white
Sunridge Middle School: The Bucks - green and gold
Springfield High School: Millers - blue and silver
Pendleton High School: The Bucks - green and gold

I went to a couple more schools but they were very small alternative schools and, thusly, did not have sports teams. I wonder why I remember all of this considering that I don't even like sports.

LSU, which I may or may not be attending, has the colours of purple and gold. The mascot is a tiger.