As of the 2008 season that has happened twice: Frank Robinson - 1956 National League Rookie of the Year and 1966 American League MVP Dick Allen - 1964 National League Rookie of the Year and 1972 American League MVP
Sandy Alomar won the 1990 American League Rookie of the Year Award.
I believe the MVP is the player who has done the most to help the team win. Rookie of the Year is the rookie (first season in the league) who was the best, compared to other rookies.
Rookie of the Year is a yearly award given by most sports leagues to the best first year player in the league.
rookie of the year
the rookie of the year award
The 1970 American League rookie of the year winner was Thurman Munson The 1970 National League rookie of the year winner was Carl Morton
daryl strawberry
Dwight Gooden
Dwight Gooden was the 1984 National League Rookie of the Year.
The 2007 American League rookie of the year winner was Dustin Pedroia The 2007 National League rookie of the year winner was Ryan Braun
The 1984 American League rookie of the year winner was Alvin Davis The 1984 National League rookie of the year winner was Dwight Gooden
There was not a rookie of the year for 1996