I can’t tell you how many times I’ve women coming out of Tast D-lite (or any of those other low cal frozen yogurt shops) with a medium or large size container “alternative ice cream” loaded with toppings. I decided to do a little investigation to see how bad or not so bad these toppings were.
On my way home from the gym, I pass Tast D-lite. While I find it slightly tasteless, I will stop in
Calories in frozen yogurt toppings – Side containers (see pic)
***Sprinkles (1.5 oz = 4 T) 100-213 cal/4-8 gm fat
Granola (1 oz = 4 T) 124 cal/4 gm fat
Carob chips (1.5 oz = 4 T) 200 cal /10 gm fat
Chocolate chips (1.5 oz = 4 T) 280 cal/16 gm fat
Reeces pieces(1.5 oz = 4 T) 225 cal /14 gm fat
Oreo cookie pieces (1.3 oz = 4 T) 173 cal/8 gm fat
Peanuts (1.5 oz =4 T ) 221 cal/19 gm fat
Calories in toppings added to the serving of frozen yogurt
(all servings are 2 Tablespoons)
Sprinkles 50-107 cal/2-4 gm fat
Granola 62 cal/1.7 gm fat
Carob chips 100 cal /5 gm fat
Chocolate chips 140 cal/ 8 gm fat
Reeces pieces 112 cal /7 gm fat
Oreo cookie pieces 90 cal/4 gm fat
Peanuts 140 cal/12 gm fat
Bottom line, your best bet is to get your frozen treat plain – or order fruit for a topping if they have it. If you absolutely must have a not so healthy topping, get a small portion (2 T.) on the yogurt – not that container on the side. 
Note: I had a little difficulty finding the nutritional content of sprinkes. The websites I use reported a range of calories as stated above.