I really love their vegan pizza, I think it is the best in town surprisingly. Old Chicago on Broadway often has really soggy crust and spinach, and the last time I ate one of their veggie pizzas it made my stomach turn. Fortunately, Frog n Firkin's pizza crust is excellent; firm and fairly thick. They have a lot of optional veggie toppings like artichoke hearts, sun dried tomatoes, jalapeno, and others. There are a few other vegan options on the menu, including I believe a veggie sandwich, which I have not tried. They have a good selection of beer as well.
Of course, the environment sucks. But it's a college bar on University, what do you expect? My girlfriend and I usually find the most quiet spot, which is usually in the back of the restaurant past the bar. Frog n Firkin offers delivery, so if you hate the environment but love the food, then you can order delivery.