Pay attention to the words in various contexts and if you are seeking truth and reality you will recognize that the word
glosse in the Greek means "language"
Tongue is just the archaic word for language.
Example: He spoke in his native tongue.
Here is the same word used by John ( 1 John 3:19)
18My little children, let us not love in word, neither in
tongue; but in deed and in truth. KJV
Read Corinthians and use the word "languages" instead of "tongues" and it is undeniable that Paul was addressing known earthly languages if one reads the letter with correct hermeneutics.
We have information now, this is not the turn of the last century where people were fooled by false teachings.