I think they’re called ‘coaches’. Many (not all) were players, themselves.
Having both veteran players and coaches that can pass that knowledge on to younger players is the ideal. Thielen did that well from the limited anecdotal evidence we read and the recent Coker interview. If Renfrow can be brought back onto the active 53, he can fill that role, too. If not, we’ll just have to rely on Moore, Idzik and Canales.