need inspiration for filling snacks for school please

[AdoraBell]

Preteen DDs now go for lunch in school at 2pm, so I need to give them snacks that will keep them going until then, that they can eat standing up in the playground, at room temp or kept cold and they won't appreciate a sandwich every day.

Any ideas? would something like a falafel work cold? I've never eaten them. I'm thinking pita breads with a protein filling one day, did think of a small pasta salad but then remembered they'll be in the playground.

The usual fruit, yoghurt, nuts etc that they've been taking isn't substantial enough now.

TIA

Thanks, didn't think of roasted chickpeas. Doh!

I found something in the recipes thing on here that might work, lentils, cheese and carrot baked into cake shape.

Will get working on rotating things for them. We're in forrin land and anything goes, I need to get or possibly make some nut butters.