OK here is a list of strains and there fruity flavors.
Of course BlueBerry
Mango
NYCDiesel(Grapefruit)
God Bud, Purple Urkle, some Romulan have a grape flavor.
Orange Kush taste like Oranges big time!!!
So any orange strain.
They have Banana, Strawberry Cough ,Apple and so on.
No need to flavor your weed.
Just grow the right strain with organic's.