I’ve spent years studying tongues as part of the diagnostic tools of Traditional Chinese Medicine, and I gotta tell you, very few people have “normal” tongues. Scallops, white or yellow coatings (“greasy” coating are the grossest), bumps, swellings, red spots, pink spots, white spots, black spots - black greasy coating is NASTY! There’s even some people with “hair” on their tongues!
If you have no other symptons of thyroid issues, I wouldn’t worry about it. There are very few tongue conditions that Western Doctors get concerned about.
If you were interested in a TCM diagnosis, I’d need to know a lot more, like the color, coating and shape of the tongue. Scalloped edges alone tell me that there’s likely something kerfluey with your digestion, but not exactly what. And by “kerfluey”, it could simply be as simple as eating a standard American diet, not something that TCM approves of. At a wild guess, I’d guess you’re probably a woman with bowel issues - loose stools or diarrhea being the most common symptoms of illness for you. (For those playing along at home, scalloped edges are a sign of “Spleen qi deficiency” or “Spleen yang deficiency”, depending on whether the tongue is swollen or not.)
So there you go. Now you can be hypochondriac in two medical systems!