Does the Cadillac Escalade have same body frame as old GM Avalanche truck?

No, the Cadillac Escalade and the Chevrolet Avalanche do not share the same body frame. While both were GM products and shared some platform elements in certain generations, they were never built on the same basic frame. The Avalanche utilized a body-on-frame design derived from the Silverado pickup truck platform, whereas the Escalade, depending on the generation, has used various platforms derived from SUV architecture, never directly from the Avalanche's truck platform.