Yes, radish greens are edible and delicious!

1 bunch radishes, roots sliced, greens chopped
black pepper to taste

Dressing:
2-4 Tablespoons sour cream
2 tablespoons milk
1 Tablespoon lemon juice
3 Tablespoons minced fresh herb like dill, scallions, chives, parsley etc. (Optional)
salt to taste

Wisk up dressing ingredients.  Place radish greens and radish slices in bowl and toss with prepared dressing.  Add cracked black pepper to taste.  Serves 2-4.