A three-star recruit (per 247Sports), Calloo chose OSU over offers from Illinois, Ole Miss and SMU, among others. Originally from Canada, Calloo is the fourth incoming freshman to what's shaping up to be a young, transformed OSU roster.
He joins Duncan Demuth, a 6-foot-8 forward from Seminole, Florida; Yor Anei, a 6-foot-10 forward from Lee's Summit, Missouri; and Kentrevious Jones, a 6-foot-10 center from Macon, Georgia.
Calloo is the third addition to the roster since the end of last season, joining Jones and USC Upstate guard Mike Cunningham.
"He has a great shot for a player his size, but he also has good ball handling ability and can drive and make plays in the paint," Boynton said. "He is a really good finisher and an aggressive rebounder. He will add to our versatility and length."
A Windsor, Canada native, Calloo is just the second Canadian player in OSU history. Howard Kelsey, who played from 1975-78, is the other.
"Mo has never backed down from a challenge and that is one of the first things that I liked about him," Boynton said. "He has competed with and against some of the best basketball players in the country at the high school level and knows the work and commitment it takes to be a winner. We can't wait to work with him and help him become the best player he can be."