Kiwifruit, being vine berries, have tiny black seeds that are perfectly edible. If you don't like the speckled effect they give this drink, however, strain the seeds from the purée before adding the remaining ingredients.
This smoothie is delicious but not especially sweet, so add sugar or honey to taste.
Purée the kiwis in a blender with the lime and pineapple juice. When smooth, add the frozen yogurt and blend till thoroughly combined. Taste and add honey or sugar, as desired.