ifIf I am not wrong, in some languages, the word for "mama" is used for other relatives rather than "mother", for example, "mama" means "father" in Georgian, also, "mama" means "grandmother" in Manchurian.
alsoAlso, it is said that the Eyak language don't have bilabial consonants in native words, they probably don't even have words like "papa" and "mama"
alsoAlso it is said that "huh" is a word that has the same meaning in (almost) every language, however, there could still be counterexamples.