Courtesy of Intermat. Not sure if they counted the last 10 or 11 tournaments.
NCAA All-Americans by School: (2012-22)
Penn State: 62
Iowa: 56
Oklahoma State: 50
Minnesota: 44
Ohio State: 44
Virginia Tech: 36
Cornell: 34
Missouri: 34
Michigan: 33
Nebraska: 30
Lehigh: 23
Illinois: 22
NC State: 20
Arizona State: 19
Northwestern: 19
Wisconsin: 18
Iowa State: 17
Oregon State: 15
Rutgers: 15
North Carolina: 13
Northern Iowa: 13
Oklahoma: 12
Edinboro: 11
Stanford: 10
Wyoming: 10
Pittsburgh: 9
Princeton: 8
Virginia: 8
Central Michigan: 7
Kent State: 7
Duke: 6
Old Dominion: 6
South Dakota State: 6
Appalachian State: 5
Cal Poly: 5
Lock Haven: 5
Maryland: 5
Rider: 5
Indiana: 4
North Dakota State: 4
Ohio: 4
Penn: 4
West Virginia: 4
American: 3
Binghamton: 3
Boise State: 3
Clarion: 3
Hofstra: 3
The Citadel: 3
Utah Valley: 3
Fresno State: 2
Harvard: 2
Michigan State: 2
Brown: 1
Bucknell: 1
Campbell: 1
Columbia: 1
CSU Bakersfield: 1
Eastern Michigan: 1
Franklin & Marshall: 1
Navy: 1
Northern Illinois: 1
Purdue: 1
SIU Edwardsville: 1
Purdue only one. Ouch. That's really bad.
Caught me by surprise too. At first thought it seems they are/have been better than that.