1 Corinthians 14:13

13 For this reason the one who speaks in a tongue should pray that they may interpret what they say.

Read 1 Corinthians 14:13 Using Other Translations

Wherefore let him that speaketh in an unknown tongue pray that he may interpret.
Therefore, one who speaks in a tongue should pray for the power to interpret.
So anyone who speaks in tongues should pray also for the ability to interpret what has been said.