Answer:
Here are three made-up French words that meet the criteria:
-Blorimbeau (Pronunciation: blor-eem-bo)
This word has a vowel pair "ea."
It has three syllables.
-Franchinou (Pronunciation: frahn-shee-noo)
This word has a nasal vowel "an."
It has three syllables.
-Glamarifou (Pronunciation: glah-mah-ree-foo)
This word has three syllables.
Please note that these words are entirely fictional and do not exist in the French language. They were created for fun and to meet the specified criteria.