It's a valid question, but may not be as popular as What language does your mother speak?
What other languages do you speak? is more common than
What other tongues do you speak?, but both are valid questions. To my ears, there is no difference between the two.
The phrase 'mother tongue' seems to be a set phrase. I've heard 'native tongue' and 'native language' used instead, but I don't believe I've ever heard 'mother language'.
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