No, not any I know of. Tagging is also commonly called mentioning here.

edit: Oh, I think I know what they mean. It’s the labels or badges you can put on people, I think. But that is not a native Lemmy feature. Thunder and Summit have them, for example.

OP should make clear whether they mean mentioning or labeling people in apps.

I do, only rarely.

Your tag would be @OmegaLemmy@discuss.online