When drag and gravity overcome the forces of lift and thrust on any aircraft, the aircraft will stall. Typically a stall occurs when the angle of attack becomes too steep. An aerodynamic stall has nothing to do with an engine quitting.
A tip stall occurs when the very tip of one wing fails to sustain lift, causing the airplane to roll in the direction of the stalled wing. Tip stalls usually occur on landing approaches or very low speeds.