Yes. There are actually quite a few threads on this subject but they aren't always easy to find as people use different terms to describe the Expedition SSV, sometimes called an "XL."
I almost bought one of these trucks last year and it didn't have a 3rd row so I did a good bit of research. I was researching the EL XL, so if yours is a "Shorty" some of my info may not apply. I discovered the holes are already there in the body but they aren't tapped. According to what I read, the bolts that go into these holes are designed to be self tapping.
Keep in mind, you'll need not only the seats but also the seat belts. Both the seats and belts are critical safety items so use only OEM parts and be absolutely sure to follow ALL specs laid out in the Factory Service Manual for your year truck. This means tightening all bolts to the exact factory torque specs.
Also, the EL and Shorty models have completely different rear shoulder belt installations for the third row. The Shorty routes the shoulder belts through a ring bolted to the "D" pillar. On the EL they go through rings attached to the headliner and then down inside the rear quarter trim panels. Don't forget there are curtain airbags up there! So, be very careful when installing this extra hardware. Nothing you do must interfere with the curtain air bag system.
I actually found pics online of an EL XL for sale where they added the third row seat but installed the shoulder belts using hardware from a Shorty. This was downright dangerous because it totally changed the geometry of the rear seat belts, likely endangering anyone strapped into those seats.
Here's the correct belt installation on an EL:
Here's how NOT to do it! Note they are using the mounting locations for a Shorty, but this is an EL:
