tiny occarina on a necklace that you can actually play a tune on ( and it's made from clay)

I have one of those. a our hole one. Bought in a visitor centre gift shop either in Glen Coe or Kilmartin Glen. I still hav the box, which calls it a song stone. I suppose because it is size and shape of a beach pebble.

Lovely little thing and easy to play

I used to make all kinds of musical instruments.

Asian string instruement - Various size elastic (rubber) bands stretched over tissue box.
Tom tom - Quaker oatmeal carboard tubes with a cut balloon over to make a skin.
Shakers - cardboard paper towel tube with dried beans inside.

I tried and tried to make the comb and tissue paper kazoo, but could not get it to work. Just made my lips tickle.

I loved my swanie whistle. I had a red one.

Does anyone remember clackers? Two heavy plastic balls suspended from string and ring. You were supposed to swing them in a way that made them clack together above and below your hand. They banned them in the schools and with good reason. You could knock your teeth or a nearby kid out.