If you still have the letter, would you mind posting it to see what specifics they described? Or emailing it directly if you prefer?
It seems ludicrous that you "aren't allowed" to use your choice of verbiage in the flavor profile of your product..... especially when big co's produce product flavors like Cotton Candy, Whipped Cream, BubbleGum, and S'mores. Clearly flavored-aimed for a youthful pallet...
Cheers,
Aaron