My DH is manly and big and strong and grrrr.
His favourite snack is coconut yoghurt, fresh berries, granola and honey.
Super girly snack but yum and gives him plenty of energy as he has a v sporty job. No dairy in it though, which is better.
For a savoury snack he will have toasted sandwich with avocado, sliced chicken, chilli flakes. Avocado instead of butter/mayo.
Nuts for a quick snack. Fruits.
What are his main meals like? If it's lasagne, chilli, chicken wings etc I'm not surprised he will need to lose a bit of weight (especially if he isn't very active, I'm not sure if you said this or no?)
For dinner we will have fish/white meat + plenty of veg. Or quinoa burgers (surprisingly lovely and filling) with large salad. Something like that.
What does he drink through the day? Is it mainly water or does he drink sugary juices?
I think it's more complex than finding snacks for him - if he's overweight he shouldn't be having many snacks