The keto diet is not a matter of calories, it is all about what you eat and not how much.
For this reason, as long as your snacks are 100% keto-friendly, you can have as many as you want.
However, if your goal is weight loss, and if you want to lose a lot of weight in a short time, then you should also limit your calories.
In this case, try to limit your snacks: just have them when you get so hungry that you’re risking cheating on your diet. Use your snack as a way of remaining disciplined.