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^ Those appear to be rubber marbles like you might see on a track.

The noise could be the binding phenomenon unique to AWD cars. It tends to happen at low speeds or when the car is cold. Perhaps the new tire amplifies it. The other possibility is dirt between the hub and wheel when they remounted the wheel, or minute wheel & hub deformations (differing material properties) amplified by not remounting the wheel lug holes to the same studs.

In any case, it's safer to have a good mechanic check it out in case it's something more severe.

Another point to remember for AWD cars is that the tires should be roughly the same overall diameter. Ideally, they should be the same make and type due to potentially different wear characteristics.
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