Tim Walz wasn't just coaching football to cash checks ... so says one of his former players, who tells TMZ Sports Kamala Harris' Vice President candidate was a smart mind who always got the most out of the team.
We sat down with Seth Greenwald -- who happens to be a coach himself at Hamline University now -- a few days after Walz was announced as Harris' running mate ... and he described the ex-Mankato West High School (MN) football team's leader as a "guy's guy.