Buying the hippobait proved to be a challenge for the old lady.
It is not in the store where I thought it would be.
So I went to my list of to do and pressed on it and got this.
Then I hit the buy button on the above screenshot and was taken to the pond.
I hit the green circle where you select baits and was taken to the next screenshot
Then I was taken here
Costs 19 gems but you get 19 gems for buying so first hook is free.
I don't see where it can be crafted.