In order for something to cross-pollinate, there must be a flower. Although both walking onions and garlic may have what appears to be a blossom, they will not produce a viable seed. Even when planted as bulbils, the resultant garlic bulb will always be true to its parent plant.
Certain shallots will produce seeds but they are usually onions rather than true shallots. True shallots and potato onions are normally only propagated by bulb division.
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