Can you deepen your voice before it cracks on its own?

Okay first off listen up. My voice hasnt dropped yet and im not trying to speed puberty up. I have read guides to deepening your voice aka stretching your vocal chord ( Bingbong dingdong kingkong crap) It does help me get a little lower if I do a few days in a row. But my question is, if I make it a routine will my voice deepen even though my vocal chords havent lengthened yet?