Frost is accustomed to being in the middle of things: he was the quarterback for Nebraska, last year's co-national champion.
Carroll said he was skeptical that this team's offense is better than that of last season's team, which was the co-national champion.
He also named co-national champions at the conclusion of the 1933 season.
The 1905 Yale team went 10-0, outscored its opponents 227-4, and was picked as co-national champions with the University of Chicago.
The teams played to a 7-7 tie and were named co-national champions by most media.
Last year's Rose Bowl, which made Michigan the co-national champion, rated a 17.6.
Subsequently, the Leopards are recognized as a co-national champion in the 1926 season.
It was established for the 1992 season after co-national champions in both 1990 and 1991.
The two teams were later named co-national champions for the season 37 years later by Coach Davis, who had become the sport's pre-eminent historian.
The output testified to how soundly the Irish beat last season's co-national champions despite being outgained, 472 yards to 376.