So I'm happy to say that a month later, all of the fig trees I "offed" have bounced back. Here are two pictures of one of my unknowns that suffered foliage damage.
This tree was actually kind of stunted to begin with. It rooted really well, but after it put out four or five leaves, it didn't really do anything for two months. It definitely got the worst of the Off. All of its leaves dropped.
The first picture is from July 16, six days after my fight with the yellow jackets. You can see a couple of small leaves popping out. Unfortunately, a couple of days after I took that picture, a friend's dog chewed off the tip of one of the two branches.
The second picture is from today. The tree's more vigorous than it ever was before I poisoned it with bug spray. And the branch that got chewed up--it formed two new branches.