Peanuts have just 4 net carbs per 50 grams. That's about 40 or more shelled peanuts, which is a nifty afternoon snack. The same serving contains 13 grams of protein.
Plain regular yogurt isn't very good when it comes to protein, but plain Greek yogurt is a better alternative. It has 7 grams of protein and 7 carbs per 100-gram serving.