Pact of the Chain Warlocks have access to an invocation called Voice of the Chain Master:
Voice of the Chain Master
Prerequisite: Pact of the Chain feature
You can communicate telepathically with your familiar and perceive through your familiar's senses as long as you are on the same plane of existence. Additionally, while perceiving through your familiar's senses, you can also speak through your familiar in your own voice, even if your familiar is normally incapable of speech.
One of the limitations of the Druid's Wild Shape feature is as follows:
You can't cast spells, and your ability to speak or take any action that requires hands is limited to the capabilities of your beast form.
If a Druid/Warlock multiclass had this invocation, could they speak through their familiar, even while using Wild Shape to assume a form that does not have any languages?