Boeing B-53 aircraft?

I was wondering if anyone could clear up a question for me.
A guy in work mentioned about a derivative of the B-52 used as a para-drop aircraft called the B-53. Looking on google i can only find information about a nuclear weapon designated the B-53.
just hoping someone could enlighten me to any history of an aircraft designated the B-53.
(not sure if this should be in the modern military forum or not. so if it’s in the wrong one i appologise)