Is there a freeze plug between the motor and transmission on 2005 Dodge Grand Caravan?

No, there are no freeze plugs located between the engine and transmission on a 2005 Dodge Grand Caravan. Freeze plugs (also called core plugs) are found in engine blocks and cylinder heads to seal off casting openings during manufacturing. The interface between the engine and transmission is a much more complex mechanical connection involving a torque converter (automatic transmission) or a clutch assembly (manual transmission), and doesn't utilize freeze plugs.