Yes, the size of a person's body, including their vocal anatomy, can influence the pitch and depth of their voice. Generally, larger individuals, including men, tend to have larger vocal folds, which are the two bands of tissue in the larynx (voice box) responsible for producing sound. Larger vocal folds vibrate more slowly, resulting in a lower-pitched voice.
However, voice depth is not solely determined by physical size. There are other factors at play, such as genetics and hormone levels. Testosterone, a hormone that is more abundant in males, is associated with the deepening of the voice during puberty. When the larynx grows and the vocal folds thicken due to increased testosterone levels, the voice tends to become deeper.
So, while larger physical size may contribute to a deeper voice in men, it's not the only determining factor. Some smaller men might have deep voices because of their genetic makeup or hormone levels. Additionally, individual variations in vocal anatomy and how the vocal folds vibrate also play a role in determining a person's voice pitch and depth.
It's worth noting that having a deep voice is not limited to men; women can also have naturally deep voices due to similar factors, though it is less common. Ultimately, the pitch and depth of a person's voice are the result of a combination of physiological, genetic, and hormonal factors.