This is a cute little ghost with whistle function:

• Plays two off-key notes: F6# and E6 (cover the other hole)
• Blow in reverse direction and it makes a howling wind noise.
• Hole on top for attaching to bag or hanging up as Halloween decoration.

Combine with this little chain that lightly press-fits into the arms: https://www.printables.com/model/601159-chain-for-small-ghosts-print-in-place 

Also checkout best buddy of Ghost Whistle, Skelly Eyeball Skull: https://www.printables.com/model/615055-skelly-eyeball-skull 

Printing Tips

The eyeballs are print-in-place and need to come out smooth for them to rotate easily and not stick. Go for slower, quality print settings. PrusaSlicer 0.2 mm QUALITY with 3 perimeters should work fine.

Pupils are recessed and easy to fill in with a black marker pen.