Hi Lisa,
I don't know how "froggy" your Daddy's voice is. As said by others, the voice of most oral cancer patients is adversely affected after treatment, at different degrees. I lost my voice during the latter half of treatment and lasted for a month. After that it was back but not the same old voice I once had. I could take up teaching again and students had no difficulty in understanding me. I am now almost 5 years in remission, the voice is still raspy and it changes without apparent reasons. There are times when my voice is very clear but other times people think that I am suffering from a heavy cold. For friends who know me well, I need not explain to them and for those people who are not my friends, I just tell them I am having a cold. Time helps me overcome this voice problem and as long as it doesn't block my communication with others, I feel pleased. A small price we need to pay in exchange for our precious life.

Karen