I have never experienced a hoarse voice when hypomanic/manic (I don't think), but I could imagine such thing could happen. I experience a form of tension when hypomanic/manic. If one is tense, perhaps a voice could get raspy. Tension need not seem negative. It can be an excited or super charged tension.

I will share that my husband has told me many times that I get foul breath when manic. I can only assume the cause is some disturbance in my gastro intestinal system, or the like. Physical signs definitely come with mania for many people.