There aren't very many crunchy things on a low carb diet, but there are some. Celery sticks dipped in natural peanut butter, or even just creamy ranch dressing, are quite tasty. Pork rinds are both crunchy and salty. I had never tasted pork rinds until the other day, when I saw a bag in the chips aisle of the store, and on a whim bought some. There are flavored and regular pork rinds, and they kind of taste like bacon, which is indeed a good snack. Cauliflower florets dipped in creamy ranch dressing are good, too. One quarter cup of almonds only have two grams of carbs and I bought a big bottle of them from my local Sam's.
Other non-crunchy snacks I eat include cheese sticks, pepperoni rounds, hard boiled eggs, and raspberries (in moderation). I have discovered that commercially prepared beef jerky actually has a rather high carb count, but some beef sticks do not. Oberto beef pepperoni sticks, for example, only have one carb per stick, but I cannot find them in Fargo. My wife has been charged to bring back several bags from Provo, as she is out there visiting the kids. Slim Jims, on the other hand, are high in carbs, as they have high fructose corn syrup in them.