5
Definitley, Yes
The Cleavland Browns
because the teams pay them not to so that they could have their logos
Lots of sports teams but manly football helmets.
The helmet project is an attempt by a fan of American football to document the changes of the team helmets design, colors and logos of big name teams. This includes illustrations of the colors and logos.
There are approximately 119 College Football teams.
The logos of football teams within the United Kingdom can be viewed on the website of FootballCrests. This site includes logos of all teams from England, Scotland, Wales and Northern Ireland.
notre dame
There never was and probably never will be as they are the only NFL team without a logo.
Teams usually contract with independent graphic artists to come up with ideas.
Zero
All states have college football teams, but not even half of the states have NFL teams.