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None of these work.
The most natural one is:
A young/baby cow is called(called) a calf.
If you wanna use "The" at the beginning of the sentence, then it would be:
The baby of a cow is called(called) a calf.
A young/baby cow is called a calf.
The baby of a cow is called a calf.
A young/baby cow is (called) a calf.
The baby of a cow is (called) a calf.