Many have claimed this but none have brought forth measurable changes. If you look into the work of SUPRA and REDZULU you will find many ideas and exercise that promote enlarging the glans. I would take one of those exercises and make solid before measurements, train long enough to see changes and keeping us updated with a progress log. Measure before and take pictures, after training for a while (90 days) remeasure using the same technique and hopefully you will show growth.