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Girls aren't the only ones who struggle with body image issues.
I want the kids in my life to feel comfortable with their bodies, positive and negative. To me, that doesn't mean never saying they don't like their thighs. In the end, fat or thin acceptance is simply body acceptance. The way you get to the point where you're comfortable with your body is what matters.
Talk to your son about his body. Give him the vocabulary that he needs to communicate how he feels about himself. Teach him that it's normal to think about his appearance. Teach him that being a boy doesn't take away his right to have feelings about his body. Don't assume that you can talk about your son's body any differently than you talk about your daughter's.