This is not an official term.
The Brotherhood of Makuta wanted to create fake Bohrok rather than use the existing swarms because they wouldn't be able to strike a deal with the Bahrag, and even if they did, the Bohrok would still travel to the island of Mata Nui and that did not suit the Brotherhood's aims.1
When the Brotherhood of Makuta couldn't awaken the real Bohrok for their purposes, they tried to build their own.2
The fake Bohrok were an experiment, not a formal part of the Brotherhood's army.3
False Bohrok had simulations of the powers of real Bohrok.4