Hi,
I would use a list.
Make a list for youself (in any editor) where you assign numbers to the objects that you have.
Lets say: lantern=1, fireplace=2, dragon=3
Now create a list in stencyl and add those numbers to it.
Now:
Show the png (create actor) and show the the text (draw text) if the number is in the list. Remove if not in the list.
Click:
Remove the number from the list if you click the actor (will remove the actor and text)
Protipp:
Add mastery to your scene.
Create a game attribute list on game start.
Sort your objects into difficulties and display them the more the scene is played.
Hope it helps!