Frank attended St. Columba's School in Ponsonby. Following school he began playing for the Ponsonby player in the Auckland Rugby League competition, Delgrosso was first selected for the New Zealand side in 1921. He made his Test debut against Great Britain in 1924 and went on to play in nine Test matches.DELGROSSO, Frank August - 1921, 1925-28 nzleague.co.nz This included captaining New Zealand in the second and third Test matches in 1924. He also played for the Auckland Provincial team in 1924 and scored a try in a 13-28 loss. He was part of the 1926-1927 tour of Great Britain.
