"Nutcracker man," "Handy man," and that other guy were all found at the Olduvai Gorge Visitors Center, Tanzania.
The nickname, "nutcracker man," was given to Paranthropus boisei because of his super-large jaw. That guy could chomp.
The nickname," handy man" was given to Homo habilis because of his tool box. That guy could flake.
The other guy is still looking for his secret identity.