Are these holes in my garage's wall indicative of flushing out carpenter ants?
That is termite damage. I had one termite attack where they combined with ants ; I did not immediately get rid of the ants because I understood they would not coexist with termites.  That is pretty extensive damage, I would replace all wood with damage. Apparently a  repair was made by squirting in expanding urethane foam ( such as &quot;Great Stuff&quot;). I have had 2 termite attacks and a few cases of dry rot and recognize the difference. And carpenter ants chewed some of the Styrofoam out of my insulated garage door ; the wonders of Texas.