Sanghas of those who practice like monks but aren't officially monks? Are there Sanghas(in the more broad meaning of the word) of those who practice like monks but aren't officially monks and have not been ordained as monks by monks? If they could call themselves "Bunks" or something besides "monks", would this be problematic? Are there any scriptures related to this?
In the Mn140 Pukkusati is referred to as a Bhikkhu before receiving the going forth;


  Ven. Pukkusati also spent most of the night sitting [in meditation]. The thought occurred to the Blessed One, "How inspiring is the way this clansman behaves! What if I were to question him?" So he said to Ven. Pukkusati, "Out of dedication to whom, monk, have you gone forth? Who is your teacher? Of whose Dhamma do you approve?"


There aren't any actively recruiting communities that i know of atm.

Also Anagarikas are basically not ordained and are in training.