.. Getting a stick

Didn't Granpa and the kid have some kind of stick fight going on in Meriloft? Next to the hatch?

Did you talk to them?

I think the key to this puzzle is a cupcake.

Granpa could frost it.

Someone could eat the frost away.

Walter only eats frost from cupcakes. Give the cupcake to Walter. He is at the Cloud Shoes shop.

Now show the cupcake to Granpa. He will give you his cane. It works for fighting, too.