SHARING INFORMATION

"have" and "has" are present tense:

I have, you have, she has, he has, it has, they have

"have had" is a combination of two verbs: present tense "have" and its past perfect object "had" + _____, like this,

I have had dinner. (I have eaten dinner)
I have had a bath. (I have taken a bath)

"had had" is a combination of two verbs: past tense "had" and its object,

If I had had a hammer . . . . (past conditional)
If I had a hammer . . . . (present conditional)

"had has" and "had have" are not combinations in English. The opposite, "has had" and "have had", are combinations:

She has had a cold for two weeks now. / She's had a cold.
They have had a cold for two weeks now. / They've had a cold.

"has had" is for third person singular subjects (she, he, it), and "have had" is for the other persons and numbers (I, you, they).

"Had have" isn't a combination in English.

quote from tesl groups.