Carroll Family Genealogy Forum
I also am looking for Carrolls in Roscommon. My Carroll family is later than yours, but their location may give you some clues for your search.
Thomas Carroll married Catherine Moran c1865. Children: Jane, born 1867, birth registered in Elphin, address given as Grange, Ogulla; another Jane, born 1867, birth registered in Strokestown, address given as Ogulla; Thomas, born 1870, birth registered in Elphin, address given as Drinagh ( or perhaps Drinmagh); Catherine, born 1875, birth not registered, townland believed to be Ballynaheglish. Still awaiting a reply from the parish priest about this townland.
It is known that Thomas and his sister Catherine immigrated to the US. Thomas married and was living in Ozone Park, Long Island, in 1938, but we now have no contact with that branch of the family. Catherine married John Sheehan, and is our grandmother.
Good luck in your search.