You use a clay gun to make those. They can easily be found in the clay section of Michael's or Hobby Lobby
it looks to be made using a clay or sugar crafting gun.--
you can find fairly inexpensive ones in the polymer clay aisle at better craft/hobby shops.
Michaels has them --- and in my area has a 50% off coupon for one item this week.
cool! I've got that cupon...it's good up until saturday..
Will get it for sure!
Makins Clay clay extruder. It's green. I got mine a Hobby Lobby for $24.99 - the 40% off coupon.