If you really want a shop bought type toy go for wooden chews, toys made out of willow (ie willow sticks etc..) or alternatively you could try hay balls, They are so much fun for pigs. They are a hanging metal mesh ball which you fill with hay and they spend ages trying to get at it. I have also filled mine with lettuce / carrot and that goes down a treat too!
Has anyone messaged these sellers to tell them its not suitable?