No I'm not joking. This really did exist but not quite in the form you envisage.
Many years ago a friend of my older brother gave him a load of Action Man toys and equipment which he no longer wanted. In amongst all this gear was one device that I will never forgot - a working vinyl turntable for Action Man!
It was actually marketed as a field radio backpack for Action Man which had a button on it which you could press to blurt out military commands! The source of the audio was a miniature battery powered stylus which played individual interchangeable coloured vinyl records. So in essence it was fully functional record player with the records about the same size for Action Man as they would be for a grown adult holding a 12" record. They were 5 different coloured records available (clear, yellow, blue, red, green) with 8 unique messages per side. It's funny to think back how much effort the manufacturers put into making this toy. It was a handheld portable audio device with interchangeable records available between 1974-76 so predates even the cassette walkman by several years.
https://actionmanhq.co.uk/figures/field ... index.html