
Hi.
While there is no scenario that shows them speaking in a foreign language, this is because the MPC (the WoL) has the Echo, which allows him/her to understand languages across all races naturally without any prior knowledge beforehand.
And as you can see in most cutscenes during 2.2-2.4 most of the Doman's never had any dialog with anybody except the WoL and other people who had the echo. Most believe that this is because they were either learning to speak the native tongue of Eorzeans or simply didnt know it. In 3.0+, we see some doman's talking to native Eorzeans so this can be believed that at this point and time, most doman's are capable of speaking some level of Eorzean or whatever they want to call it.
Hope this awnsers your question at any rate, because people speaking Doman is a thing ICly, there is just no phyisical example shown to us because of the Echo.
While there is no scenario that shows them speaking in a foreign language, this is because the MPC (the WoL) has the Echo, which allows him/her to understand languages across all races naturally without any prior knowledge beforehand.
And as you can see in most cutscenes during 2.2-2.4 most of the Doman's never had any dialog with anybody except the WoL and other people who had the echo. Most believe that this is because they were either learning to speak the native tongue of Eorzeans or simply didnt know it. In 3.0+, we see some doman's talking to native Eorzeans so this can be believed that at this point and time, most doman's are capable of speaking some level of Eorzean or whatever they want to call it.
Hope this awnsers your question at any rate, because people speaking Doman is a thing ICly, there is just no phyisical example shown to us because of the Echo.