Different award but Ewan McGrady won the Rothman's in his second year.
Brandy wins if we are talking about Dally M. A few young blokes won the Rothmans.
A few players and games played prior to their award winning season. There are probably others who I missed.
Ewan McGrady, Rothmans Medal 1991 - (16 Games played)
Barry Russell, Rothmans Medal 1988 - (18)
Mark Sargent, Rothmans Medal 1989 - (19)
Paul Green, Rothmans Medal 1995 - (22)
Greg Alexander, Dally M 1985 - (23)
Preston Campbell, Dally M 2011 - (26)
Nicho Hynes, Dally M 2022 - (36)
Ben Barba, Dally M 2012 - (53)
Campbell's win was super impressive when you consider he played 7 games on the wing that season, and like Hynes he had only started one game in the halves in his career prior to that.