Welcome
@SueS72
I hope you will be able to get some answers to your questions.
I don't have personal. experience of PPA and FTD but from what I`ve learned, people with FTD often lose their language skills in particular their expressive language. This links with PPA which I am familiar with since working with children with speech and language disorders.
If you can manage to add gestures to the spoken word when communicating with your husband, it might help. Also, is your husband still able to write to express his needs? This could make life a bit easier.
My father had dementia caused by fluid on the brain. It damaged the area of his brain connected to his throat, swallowing, and speech. He was still able to write to express his needs. Nothing elaborate or fluent but basic expressions of need which helped a little.