Teutopolis Wooden Shoes
I think Cairo's women's teams used to be the co-pilots.
I'm sure I'm missing some as well. It is worth noting that while these mascots may seem odd I'm sure they are revered in each community.
There's a special place in my heart for the Cornjerkers. Yeah, I'm weird.
Among some of my other favorite Illinois nicknames that haven't already been mentioned:
-Dietrich Movin' Maroons (I think their logo is supposed to be a roadrunner)
-Southwestern Piasa Bird