If your legs aren't growing, you're not doing squats and if you are you're not doing it with enough intensity. You have to squat to have impressive legs unless you are just a freak that was born with better genetics than most everyone else. There is no magic to thick, muscular legs. It takes work, food and lots of fucking gear bro. Up your cals to 5000 per day, squats, SLDL's, leg press and lunges and your legs will grow guaranteed