Whose trademark slurred voice may come from forceps that were misused when he was born paralyzing a nerve in his face?

The person you are describing is likely Elvis Presley.

While the exact cause of his distinctive vocal delivery is debated, it's commonly believed to be a combination of factors, including:

* Natural vocal cords: Some argue he had a naturally husky voice.

* Singing style: His "crooning" style, with a lower register, contributed to the slurred quality.

* Possible nerve damage: There are rumors that he experienced some nerve damage, potentially during birth, that affected his vocal cords.

It's important to note that these are just theories, and there's no concrete evidence to prove any one factor.