Sprouting things is a great idea, tigs. I hadn’t thought about that. If I recall rightly, it ups the protein content amazingly. Years since I’ve sprouted beans and lentils. Thanks for the reminder.
I was going to say the same as Frog, nuts. Almonds in particular are very crunchy.
Raw veg is another: in salads or as sticks for dipping in tzaziki or hummus.
Or you could try these:
https://thebloodsugardiet.com/recipes/chickpea-crackers/
If it’s chewiness you want, there are also these:
https://thebloodsugardiet.com/recipes/chickpea-flour-pancakes/