Your post was interesting to me because I come from a long line of Carrolls. We are based in Philadelphia primarily. John P. Carroll was born in Thurles, Tipperary in the 1850s and came to the U.S. in 1884.
Long story short is that one of his sons, John Carroll, left Philadelphia for Alabama at the turn of the century. No one knows why he left. He was killed in a dynamite explosion in the Town of North Birmingham. Perhaps he was working for a stone quarry?
Anyway, I don't know of any other Carrolls from Alabama and was curious to know more about your line?
Hope to hear from you!