Godd news is you can't swallow your tounge as some people would lead you to believe.
Also complaints about strange tounge sensations and feelings seem to be one on the MOST common complaints with HA.
I have to be honest I don't think I have ever herd of a tumor or growth in the tounge let alone a cancerous one, unless you have been smoking 30+ cigs a day for 40 years and then it wouldn't produce those kind of symptoms.
With health Anxiety you tend to have irrational thoughts, also your brain is over stimulated with adrenaline, cortisone and many other chemicals so you notice things more... things which a body can do off and on that normal people would not notice at all.
Also you could be doing it and not knowing it, your tounge is a muscle.
No, problem here but if it worries you more than normal and other body sensations as well you should see your Dr and try therapy or medication.
It did wonders for me, good luck