Crabb had 11 goals and 15 assists in 67 games this season.
He's the 12th forward and 18th player added to the roster for the tournament, which will be held May 4-20 in Helsinki and Stockholm.
USA Hockey announced the first 17 players for the team Wednesday. The roster maximum is 25, which includes three goalies.
TEAM USA ROSTER
Goalies: Richard Bachman, Stars
Forwards: Cam Atkinson, Blue Jackets; J.T. Brown, Lightning; Joey Crabb, Maple Leafs; Patrick Dwyer, Hurricanes; Nathan Gerbe, Sabres; Ryan Lasch, Lahti (Finland); Kyle Okposo, Islanders; Max Pacioretty, Canadiens; Bobby Ryan, Ducks; Jim Slater, Jets; Paul Stastny, Avalanche; Nate Thompson, Lightning