Agree the typical cichlid associated with trade name "Convict" is from Nicaragua and some other Central American countries.
That said, common names are rather nebulous and can be applied to different fish, in different areas.
I could see someone calling Heterotilapia buttikoferi a convict because of its stripes, and even seen some LFSs house the two together with some employees not beiing able to tell the difference.
OP maybe you should post a pic?