How do you say, "How do you say [text I want to know] in English?", in Japanese?
If I don't know how to say something in Japanese, I would like to ask the person I am speaking to, "How do you say [text I want to know] in Japanese?"

Question

Answer

you can say " (put something here) wa nihongo de nanto iimasu ka?"

Answer

How do you say (something) in English? ((something)はえいごでなんといいますか / なんていいますか / どういいますか。)
How do you say (something) in Japanese? ((something)はにほんごでなんといいますか / なんていいますか / どういいますか。)
*We have several ways of speak, so between close people, we generally ask なんていう？/ なんていうの？ / どういうの？etc

I hope this was helpful.