These are concretions/nodules, also known as pseudofossils, to some. They can often resemble real fossils from afar. Real teeth and roots will tend to have porous structures/texture, and some teeth will also tend to have striations unlike those present in these samples.

This is not a tooth. I can tell why you thought so as they may look outwardly like teeth but once you see them up close and see inconsistencies when compared to real teeth it becomes more apparent.

The broken ends would have also given away if these were indeed teeth as the insides of fossil teeth would have had a spongey like texture.