Use Humanoid Animations with aditional bones

I’m working on infected human character that has an long alien tongue, and I can’t get the tongue to animate unless I use legacy animations. Is there a way to get the tongue to animate with humanoid animation? Or rather, can I animate bones that are not normally found on a human with the humanoid animation?

Make sure that the additional bones are enabled in the avatar mask of your clip. Unity will then animate them using Generic animation on top of the standard Humanoid rig.