The 5.4 and 4.6 are notorious across the years for injector tick and cam phaser noise. Many say the phaser issue has been gone for a few years, but I just had my looked after about 3 months ago on a 2010.
The ticking you are *likely* hearing is your injectors and is completely normal and nothing to worry about, but take it in to get them to listen to it anyways- doesn't hurt anything at all. Maybe it's something more malicious, but I suspect you're hearing the injectors.
Also keep in mind, the 5.4 is a big cast iron beast with what seems to be an over abundance of plastic pieces on it which leads to something akin to a resonating chamber. They make a lot of noise but that's pretty normal. Without hearing it, it's tough to say what it is.
I drive a goat now...