[DC 86]

Here's the number of runners-up by college.  Turns out you're correct (this is since the inception of the award, not the last 20 years):

6  Stanford

5  Oklahoma

4  Iowa, Notre Dame, Southern California, Tennessee

3  Army, Ohio State, Penn State, Pittsburgh, Purdue, 

2  Alabama, Arkansas, Georgia, Georgia Tech, Michigan, Minnesota, Nebraska, North Carolina, Texas, Tulsa

1  BYU, California, Clemson, Colorado, Columbia, Cornell, Florida, Florida State, Indiana, Iowa State, Kansas State, LSU, Maryland, Oklahoma State, Pennsylvania, San Diego State, SMU, Syracuse, TCU, Temple, Texas A&M, Wisconsin

Oklahoma actually is tied with Stanford, they also has six runner-up finishes, by six different players:

Kurt Burris, Greg Pruitt, Billy Sims. Josh Heupel, Adrian Peterson, Jalen Hurts.

They also have seven winners.

[DC 86]

Here's the number of runners-up by college.  Turns out you're correct (this is since the inception of the award, not the last 20 years):

6  Stanford

5  Oklahoma

4  Iowa, Notre Dame, Southern California, Tennessee

3  Army, Ohio State, Penn State, Pittsburgh, Purdue, 

2  Alabama, Arkansas, Georgia, Georgia Tech, Michigan, Minnesota, Nebraska, North Carolina, Texas, Tulsa

1  BYU, California, Clemson, Colorado, Columbia, Cornell, Florida, Florida State, Indiana, Iowa State, Kansas State, LSU, Maryland, Oklahoma State, Pennsylvania, San Diego State, SMU, Syracuse, TCU, Temple, Texas A&M, Wisconsin

Oklahoma actually is tied with Stanford, they also has six runner-up finishes, by six different players:

Kurt Burris, Greg Pruitt, Billy Sims. Josh Heupel, Adrian Peterson, Jalen Hurts.

They also have seven winners.