Lockjaw is one of the many antagonist in the TRTF series.
lockjaw also known as Frankburt was a hidden character in TRTF 2 as a 40% Safer torture suit designed by the owner
Lockjaw would later return in TRTF 3 as a animatronic in fazbear fantasy land. in the end of TRTF 3 fazbear fantasy land has to shut down after lockjaw hugging 6 kids to death getting all animatronics banned. in TRTF 4 lockjaw returns and this time he is not possessed by BFP.