I believe that both are team mascots.
The one school, the Rhode Island Institute of Design, has a team named the “Nads”. Their cheer is of course “Go Nads!”. And their mascot is “Scrotie”, whom you saw chasing the Clam. I’m not sure who “Clammie” represents.
It just seemed like a video that fit this thread.
Here in Iowa, every year Buena Vista (beavers) faces Upper Iowa (peacocks). I was very young the first time I went to a game, and I did not get why the cheerleaders were having so much fun doing their cheers...I was trying to watch a game...