Aaron Barker's burgeoning Dallas institution, Carnival Barkers, is in a state of flux. The ice cream master lost his lease on his space at the Truck Yard this year, but opened his first stand-alone joint near the Texas Theatre in Oak Cliff. It's a good thing, too, as even the slightest doubt about the availability of Barker's most delicious creation, the Rice Krispies treats ice-cream sandwich, featuring vanilla ice cream jammed between two Rice Krispies squares, would've been utterly snap, crackle and no.