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..of course? People change accents and imitate voices and there are voice actors etc.
I'm from the rural south and I don't speak with the accent, you would probably only figure out where I'm from with the words I use.
As someone who took vocal training for most of their life, it's definitely possible to some extent to raise your voice but it takes a lot of time and patience. I don't know how to help with examples outside of a singing environment but I went from being a low alto, to a low soprano in a few years, then over a lot of time i've gotten closer to high soprano (but can't hit the highest notes with ease yet).
As a result I do have a higher than average speaking voice. My husband laughs at me because even my angriest voice (Such as when disciplining the dog and needing to sound forceful) is still "too soft"
Lmfao I guess I'm the exception to the rule then.
Got a deep voice. But it's still alright. I record it it's getting deeper.