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I never heard of shoe hangers, but anything is possible.
Although they are not adjustable stretchers, I think that they may well be shoe trees. Shoe trees come in many variations, including some that seem to be made for specific (expensive?) shoes. If you google vintage shoe trees you will come up with many variations. Etsy shows some, including this one: https://www.etsy.com/listing/449206486/shoe-cobbler-50s?ref=market and this one: https://www.etsy.com/listing/481195644/set-of-2-unique-primitive-an...; and this one https://www.etsy.com/listing/260130007/metal-shoe-stretchers-from-a...