Do you have any better pictures of your duckling?  
It is not a fawn and white.
It isn't grey either (what you are calling "mallard" is technically called "grey")
It sort of looks like either a "trout" or a blue trout to me.
I can tell better with a full body picture.
	
		
			
		
		
	
				
			It is not a fawn and white.
It isn't grey either (what you are calling "mallard" is technically called "grey")
It sort of looks like either a "trout" or a blue trout to me.
I can tell better with a full body picture.
	