Krypto, using his Super Ventriloquism to help Clark Kent fool Lois Lane
Super Ventriloquism is a power held by some Kryptonians. It allows them to project their voices onto other objects with enough skill and precision that it always fools people. It also enabled them to perfectly imitate another's voice.[1]
This power has only been seen in the Pre-crisis era. It is unknown whether it exists post-crisis.