Actually, all whole foods have protein in them. The percentage just varies by food item. For instance, leafy greens are approximately 50% protein but they are so few calories that you'd have to eat quite a lot of them to get a decent amount of protein.
I eat a vegan diet and tend not to worry about any particular macro or micro nutrient, I just eat a varied diet. Quinoa and amaranth are good sources of protein but I'd just try to see what works best for you. Eat lots of veggies, some fruit, some nuts and seeds (quinoa and amaranth are considered seeds), etc and you should be fine.
You can't out-exercise poor eating habits.