Creaking noise still there after replacing the struts front and back, do they need to wear in?

Shouldn't need to wear in. Creaking can be multiple things. Control arm bushings, sway bar links, even the subframe itself can creak if the mounts are failing. When do you normally hear it, and can you duplicate it by pushing down on the vehicle's fenders or bumpers?

Chassis noises can be hard to track down. What most shops use is a tool called a chassis ear. Basically a few microphones that you attach around the suspected areas, then you switch each mic on and off while listening to where the sound gets louder. Then you move them to that spot and repeat until you find where the sound is loudest. With a creaking like you have where it is only while driving and not there when you bounce it suggests it isn't the suspension bushings but something that rotates, like a bad CV joint or a failing bearing, especially if it's a rhythmic sounds. Using a tool to track it down would make it much faster, but I know of folks you buy a couple cheap wireless mics and use them in a similar fashion.

The struts won't creak just from driving. They creak when turning or hitting rough roads. It depends on the strut. If they used a loaded strut, those come with all the pieces attached.

You're welcome.