pudding head vs pudden-head

pudding head and pudden-head both are nouns.

Word	Noun	Adjective	Verb	Adverb
pudding head	Yes	No	No	No
pudden-head	Yes	No	No	No

As nouns, pudding head and pudden-head are synonyms defined as:

Other synonyms of pudding head include dolt, dullard, pillock, poor fish, stupe, stupid, stupid person.

pudding head (noun)	pudden-head (noun)
a person who is not very bright	a person who is not very bright