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I listened several times and honestly it is hard to tell with the background noise.
My initial impression is piston slap on a cold engine. I have experienced this on 4 different GMs over the years so I do have an ear for it (although the piston slap sound sometimes sounds different in different vehicles and engines).
I have had manifold leaks in different vehicles and I am not quite getting that feeling, but again it is very hard to tell without being there in person.
When you say a cold engine, how long before the sound goes away? I found piston slap would disappear after a few minutes of driving under a light load. An exhaust leak will sometimes result in a loss of MPG.
Toyota Family x2