Bistro Salad Crepes

Name: Bistro Salad Crepes
Ingredients: ½ cup whole-wheat flour, preferably white whole-wheat (see Tips); ½ cup all-purpose flour; ¼ teaspoon salt; 3 large eggs; ½ cup low-fat milk; 2 teaspoons canola oil or melted butter; ½ cup seltzer water; ¼ cup low-fat plain yogurt; ¼ cup low-fat mayonnaise; 4 tablespoons lemon juice, divided; 2 tablespoons water; 1 tablespoon chopped fresh tarragon, plus more for garnish; ¼ teaspoon salt, divided; ¼ teaspoon freshly ground pepper, divided; 12 cups frisee or mixed salad greens; 1 tablespoon extra-virgin olive oil; 6 poached eggs (see Tips)