It is the past tense of "have" and is used for both singular and plural.
I had, we had, you had, he had, they had.
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No, "had" is the past tense of the verb "have" and does not have a plural form.
The plural form of "do" is "do" and the plural form of "don't" is "don't." These words do not change in the plural form when used in a sentence.
The plural form of him, her, or it is them. (objective pronouns)
The plural form of "is" is "are."
The plural form of "I" is "we."
The plural form of "was" is "were."