THE PILOT STATED THAT DURING TAKEOFF FROM RUNWAY 35L, THE CO-PILOT ON THE FLIGHT CONTROLS REDUCED LEFT PROPELLER AND RIGHT ENGINE POWER AT AN ALTITUDE OF LESS THAN 100 FEET AGL. HE ATTEMPTED TO RESTORE TAKEOFF POWER WHILE APPLYING FORWARD PRESSURE ON THE CONTROL YOKE, BUT LOST CONTROL OF THE AIRCRAFT AND IMPACTED THE TERRAIN ADJACENT TO THE DEPARTURE RUNWAY. HE FURTHER STATED THAT THE CARGO MAY HAVE SHIFTED TO THE REAR OF THE AIRCRAFT DURING TAKEOFF.