#Kirby's Adventure!pic.twitter.com/auGC8usbpX
Probably Japan auction sites, I've seen it on US eBay a few times though, they tend to be called Finger Puppets. The back markings say Hal, Nintendo and 1993, so that might be useful search terms. I'm not sure of the manufacturer.
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If you're using "Kirby" in the search terms, you likely won't have many results. Try "カービィ" and you should be able to find more items.
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