I train abs 3 or 4 times per week. That is why they are so big. If you plan on having a big squat you had better train abs hard. I can't help you much on training abs for looks. I try and keep mine insulated so they don't get cold.
If you are doing lots of heavy squats and deadlifts, though, your abs are likely to become distended. Great for strength, maybe not the best for looks. When I used to fight, my waist was pretty small, I wore 32 pants, and when I made weight, they were loose. But to squat big, you need a sturdy base, and big ass, big hips, and big abs are the base.
B.