It sounds as though he is really unsettled and wanting attention to fit in. He just doesn't know how to get it 
We also moved last year and changed schools; I also have a 7yo (late summerborn, youngest in Y3). However, she is very academic and outwardly very confident. She has not had a problem making friends - but despite being fine academically, having lots of friends and social invitations, and getting an excellent report, I still wouldn't say that she has fully settled. She still asks when we're 'going home'. I think moving house and school is actually a very big deal for them and I suspect even harder for a young for year boy than young for year girl (I have a DS too but he started in YR - still needed to be accepted by a group who had largely gone through pre-school together, but it is easier to do this in a new environment for everyone).
What have you done to help with friendships? Are there any activities your DS is particularly good at? You need to help him find something which will gain credibility with the other children - or even an activity outside school where he can make friends with other local children and then have the confidence to calm down a bit in school. The problem is that it's a bit of a vicious circle and he'll be feeling more and more desperate for attention - if he's not getting it for academic work, and he feels the school disapproves, he'll be trying to go for the quick option of laughs from the other boys, but it's backfiring.
Maybe send him on a circus skills workshop, or teach him magic tricks or something, if football or another sport isn't going to help impress. I'd try to go for a team sport activity first, I.e. Something that automatically includes him and gives him a sense of belonging (and a 'uniform' to prove it!!)