Lots of ways to do this:
You can place several instances of an invisible sprite named SpawnPoint on the layout and when you need to spawn a fruit you do
System->Pick random instance of SpawnPoint
SpawnPoint -> Spawn Fruit
You can make a single Fruit sprite with multiple animations (apple, pear, orange etc.)
When you spawn or create a new Fruit, set its animation to choose("apple", "pear", "orange") - this will set random animation.
You can then get fruit name using Fruit.AnimationName expression.
Or you can create different sprites for different fruits and add them all into Fruits family.
When you create/spawn Fruits family, a random family member will be created.
Also try searching this forum and Tutorials, there should be lots of examples of such games.