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. 

A Cordial Greeting Kitty
The first thing you should do is to consult with a certified plastic surgeon because we do not know what you really need if you do not show a photo, but there are several procedures depending on what your surgeon recommends.
*Thigh Lift - Thighplasty
After a thinning process, after a pregnancy or due to aging, the skin loses its elasticity. The skin on the upper legs becomes flaccid and wrinkled, folds may also appear.
Leftover skin can cause limitations, both aesthetic and functional. Due to the excess skin, walking may cause irritation of the skin between the legs. A thigh lift (also called a thigh lift) can offer a solution.
In a thigh or thigh lift only the skin and the subdermal tissue are removed. With a liposuction-liposculpture we can eliminate any excess fat. Both interventions are performed during the same surgical session.
Alway To Serve you, Dr. Manuel Ventura 
Certified, Medical Research Institute of Plastic Surgery in Sao Bernardo do Campo, Sao Paulo, Brazil.

Hello and thanks for your question.
 localised fat deposite in lower body makes leg heavy  inspite of loosing weight. Liposuction stubborn fat from thigh, calf ,butt   can make your leg really thin.
please consult board certified plastic surgeon and discuss bout the pissibily of getting thin legs
 Best of luck.
Dr Milan Doshi