Charlotte:

"Banama" (Banana)
"Piba-biller" (Peanut butter, rhymes with caterpillar)
"皮豆" (potato in Chinese)
"maminnow" (potato in English; also tomato)
"'Aika" (Micah; also calls me Daddy, 爸爸 and 老公)

Maryann:

"Bababababa" (???)