^^^^ this ! ^^^^^
Piston slap is exactly what I was going to say. It’s a high probability among the class of noises that go away when the motor is at full operating temperature.
I have piston slap in my ‘02 Jaguar XKR, as do many owners of the 4.0 - 5.0 liter Jag V-8’s. Just letting the car warm up more before putting a load on the engine will keep it at bay, and keep it from driving you crazy.
Z