Here is a Pillsbury Doughboy pinback button. current buttons available for sale are listed further below.
Vintage promotional Pillsbury Doughboy button.
Sometimes you will come across custom homemade buttons like this one.
Although not an authentic Pillsbury product, and most are not real collectibles and quality is usually questionable, you never know what you might find.
Buttons of this type sometimes do become collectibles in their own right over time, and for your own personal use could be quite an interesting addition to your button collection.