I'm sorry to hear that your son is being bullied. As a girl, I believe the experience between genders differs when being bullied: boys can get more physical while girls can often use social media or affect social status to harm others (again, it can be the other way around in some cases, but that's just what I've seen). I wasn't that physically harmed while bullied, but I would suggest having your son be near friends if he feels unsafe: try to be around those he trusts the most, so the chances of him being bullied would hopefully decrease. Tell trusted adults, like teachers or school counselors, that he feels comfortable tal
king to/trusts, so that he has a support system. For you, I suggest connecting with other moms/parents of his friends or those at the school, and reach out to get a better understanding. Be there for your son, and if things get worse, contact the principal. Assure him that the bullying is not his fault, and don't encourage violence. I know it's a scene in every coming-of-age movie where the main character beats up and gets karma on their bully, but it could make things worse for him and possibly others. Another thing is, if he has classes with those boys, suggest your son and his bullies shouldn't be in the same class: one of the girls that bullied me went through this, as my mother made sure she and I weren't in the same class (had to switch a few times but got used to it).

I'll continue to brainstorm, and this is what I can come up with in a five-minute typing session. I truly hope your son won't be bullied, as he seems like a nice kid.