A Study Was Done
Researchers from Austria, Czech Republic, and Sweden conducted a study and released in 2016 their conclusions, which said that Freddie Mercury had a rare and unique singing voice. The study stated that Mercury likely used subharmonics, in which the ventricular folds vibrate along with the vocal folds.
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To give you some perspective, most human vocal patterns never use the ventricular folds. Freddie’s vocal cords moved faster than other people’s. While a typical vibrato voice will fluctuate between 5.4 Hz and 6.9 Hz, Freddie’s was 7.04 Hz.