My neuro noticed I had tongue "tremors". It doesn't feel like the twitches I have in the rest of my body, but it will move my tongue. It is probably best described as a shakiness. I find that anxiety plays a role in the "tremors" I have in my tongue. Also, if you stick your tongue all the way, it has a natural tendency to move a little. After all, you are putting a strain on the muscle that it is not used to. I worried about bulbar onset too. The worry was so invasive, that it make me feel like I had trouble swallowing and slurred speech.
Chris