Do you mean piston slap? Noise like piston slap are repairable only by an engine rebuild.
no
Engine internals worn Piston "slap" Rod "rap" Engine internals worn Piston "slap" Rod "rap"
Bad engine bearing? Piston "slap" Fuel Octane rating too low
Yes
They do seem to have a tendency toward "piston slap" until the engine is warm. That's where the bottom skirt of the piston wears a little and becomes small enough to rock a couple thousandths of an inch at the bottom of the stroke. When the piston rocks quickly it makes a sound that is characteristic of piston slap. That's the bad news. The good news is, the engine can run several hundred thousand miles with piston slap and as long as it goes away when the engine warms up... no problem. It's more of an annoyance than anything. But If you insist, you can have the engine rebuilt, spend a lot of money and MAYBE it will all clear up.
Look into piston slap
Rings around one or more of the pistons have worn down to the point of letting the piston 'SLAP' around in the cylinder. So it is called 'piston slap'. It gets louder as the engine goes faster so you may not be able to hear it at idle. The only remedy I know if is a ring job. Otherwise you'll just have to drive slow and pour more and more oil into the engine between oil changes.
Most likely you are hearing piston slap. Probably time for a new top end.
Worn engine parts. Most likely a rod bearing is worn.
Piston slap and timing chain related noises can be very similar. If it is a piston slap noise the noise may be louder during power braking and may quiet down as the engine warms up.
Typically.... Connecting rod bearing / crank bearing. But it could also be piston slap, or flywheel.