Using a food processor with a shredding disk, shred the apples, carrots, jicama and daikon radish.
Place the veggies in a large bowl and toss with green onions, cilantro, pumpkin seeds, coconut (if using) and lime juice.
In a small bowl, combine the yogurt, mayonnaise, mustard, and honey. (For a creamier consistency, use a blender or food processor.)
Mix together veggies and dressing.
Cover and refrigerate until serving time. (Mixed salad is best served the same day.)
Dressing may be made up to 2 days ahead; keep separate, cover and refrigerate.