so the pitch of your voice is mostly determined by the “vocal folds” in your throat. smaller ones create high pitched voices. and larger ones create lower pitched voices. in general the larger your neck, the larger your vocal fold. so yes, there is some truth behind this. and also if you look at dogs too. small dogs are all super high pitched barks, and large dogs are lower pitched barks. humans can somewhat control their vocal folds and manipulate the air to alter their pitch.
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