Hello Sequoyah,
One thing that can happen, and did happen to me following more my partial glossectomy than either of my two diagnosing biopsies, was that as I was on a near liquid diet for long enough the taste buds do not get worn down. So as your tongue is healing and immobile the taste buds can take on an almost "hairy" appearance and feel. You MIGHT be experiencing something similar to that. For me once my tongue returned to normal size, and I could eat solid foods again the odd hairy tongue phenomenon went away. I think my surgeon prepped me for that possible side effect, or I asked about it at a follow up visit.
Once things start scraping the quickly growing taste buds, the outer layer of cells get scraped off and things go back to normal, that was my understanding.
By four months I would think if your diet is back to normal and you have no pain eating, if the above explanation were it, it would have been resolved.
I do have some odd textures and areas, some have mild pain in certain times and certain tongue positions.
My surgeon said in my cases, it is likely just after effects of the trauma of surgery.
New scar tissue forms and pulls the tongue into new shapes, new areas of rub with teeth develop, etc...
But its crucial to discuss that with your surgeon and let them examine that to ensure it is something benign along those lines.
Best wishes for a simple benign explanation.
R/
CQ
