Acts 2:4: Should the Greek word ‘glossa’ translated as ‘tongues’ be interpreted to mean known languages?

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And they were all filled with the Holy Ghost, and began to speak with other tongues as the Spirit gave them utterance (Acts 2:4 KJV).

From a Greek Interlinear translation I see that the Greek word ‘glossa’, translated “tongues,” literally means “languages.” Within the context of Acts chapter 2, I take that to mean the disciples spoke in other known languages, and that they were understood, even though those disciples did not know the language the Holy Spirit prompted them to speak.

However, some denominations use the expression “speaking in tongues” to mean speaking unknown languages. Is this what ‘glossolalia’ means, the phenomenon of speaking in an unknown language?

Does this have the same meaning as intended in Acts 2:4 which says “other tongues”?