The correct term is disfonico, with tilde. It means struggling to speak. It is synonymous with ronco, which is hoarseness. Is not the same as aphonic, which is without speech, that can not speak.
It is assumed that disfonico comes from the word dysphonia, problems speaking, disfonico is someone with " hoarseness " as it is commonly called to him who speaks with difficulty, and hoarseness is absence of voice