Could I have thinner legs with surgery?

In theory, you may benefit from liposuction. It can remove excess fat from the thighs, knees, calves and ankles. However, the legs are a difficult area to treat because they have an extensive venous and lymphatic system and therefore prone to swelling and soreness after treatment. Please consult a board-certified dermatologic surgeon with experience in liposuction of the legs who can examine you and determine if you are a good candidate.
 

Thinner legs is a reasonable goal that can be achieved with #Vaser liposuction. It is a minimally invasive fat removal and body contouring liposuction procedure, and is an alternative technique to the traditional liposuction methods. This procedure can be carried out on any area of the body, especially those area where fat are easily stored like the thighs, buttocks, knees, calves, and ankles. I believe it is easier to sculpt and contour the body with vaser body sculpting. Please do remember that the
most important factor in the quality of your result is your choice of surgeon.
You should consult with a board-certified plastic surgeon that have extensive
experience with this procedure. Best of luck!#RealSelf100

It would depend on what's causing the extra weight on your legs. It is best to schedule an appointment with a board certified plastic surgeon for an in-person examination. Usually, Liposuction is best recommended in cases such as yours.