Finally, an answer! Leeneia, I think Mattie is a person rather than a brand of tobacco.
Maybe the editors were trying to represent Jamaican dialect, spelling the words in their own way. There are various ways of spelling the same words, depending on the editor's choice. "Ketch' - I thought I'd read that word in a different context, thanks for reminding me that it is a type of boat. Your theory about tobacco is a good one.