Look for the right button (make sure there is one in the batch that fits the description!) – use process of elimination and talk about shapes, colors, etc.
Draw a picture of Toad’s jacket
Glue on the right button, then several ‘wrong’ buttons
Older children could cut out a felt jacket and sew or glue the buttons on
After the glue dries, you can shake the jacket and see if you ‘sewed’ them on tight enough
Be sure to leave plenty of time for scattering, sorting, and otherwise playing with the buttons!