Preheat the oven to 350°F;. Spread the walnuts in a pie plate and toast until golden, about 10 minutes; let cool, then coarsely chop.
In a large bowl, whisk the vinegar with the oil and season with salt and pepper. Add the figs, greens, parsley, mint, dill, chives, pecorino, and walnuts and toss gently. Serve right away.