Squeek, then pop from front end
 

It's pretty cold this morning, which maybe has something to do with the squeek and pop from my passenger side front end. If I hit a dip or something to let the suspension articulate enough it will squeek like a non-greased bushing, then pop/bump like something is loose. It's only when I drive. If I bounce the car with my hand it won't do it.
Ball joint? Control arm?
Thanks