[1] Cronin signed with the Providence Steam Roller of the National Football League (NFL) in 1927.
[2] He played in 12 games, starting three, for the Steam Roller during his rookie season in 1927, scoring one punt return touchdown.
[3] The team finished the 1928 season with a 8–1–2 record and were named NFL champions.
[4] Cronin played in all 12 games, starting five, in 1929, and scored one rushing touchdown.
[5] Cronin appeared in all ten games, starting three, for the team in 1930 but did not record any touchdowns that season.