Edy's, Dreyer's (which I think are both the same company now) and Blue Bunny have great frozen fruit bars. Some have sugar, some are sugar free, and some are no sugar added, so you have to read the lables. I think all are fat free and the calories range from 15 - 100. I just bought the Blue Bunny FrozFruit strawberry bars (35 calories for a full size bar). Yummy! I also like the single size bars that come in mixed packs. My favorite flavor is probably the lime no sugar added, but I like all of the flavors especially the berry ones.
The cocunut and other creamy flavors are a bit higher in calorie, so you really have to read the labels.
Another great "ice cream" I make at home. I throw frozen strawberries or other frozen fruit into the blender or food processor and process with a little skim milk until it's creamy. If I want a milkshake I add more skim milk. Then I put it in a bowl or glass and add Splenda if I want it a little sweeter. If I want sorbet or a smoothy instead of ice cream I just use diet Sprite or Mountain Dew instead of milk.