Rapid clicking means there is insufficient voltage for the starter to fire, its either corroded battery terminals or a weak battery. The battery may act OK if warmed up but in cold weather it will act up. It takes a boost, so that's all the tests you need, if the battery terminals are clean, get a new battery.

No matter the testing. it still sounds like a bad batt to me from what you described.

If it wont start , then you jump it and it starts. Then everything is working except the batt.. Or possibly the the batt cable connection to the batt. When you jump it, you bypass the cable connection to the batt.

You should've known what you got yourself into when buying a ford

P.S - It has a 5.4L engine

I go to start the car and all i hear is multiple fast clicks, my question is, What could it be? I took it to autozone and tested the battery, battery came out good. I begin to think hmm maybe the starter but it will take a jump from another car but heres the theory, once its running for awhile it seems fine, I tried shutting it off and starting it back up to get the clicking noise, but it starts up every time. I did this for 15 minutes, each time didnt hesitate to start up.

I begin to think its the alternator but we replaced that last year, not to sure if autozone tested that while testing the battery but wouldnt the battery register almost dead from not charging. It seems to do this a lot in cold weather so im not to sure where to go from here.