Can the pinch-off voltage be equal to zero?
In my opinion no, because the JEFT would be off all the time, isn't it?
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I suggest that you study how a JFET works. The JFET is a "pinch off device. It needs a $V_{gs}$ < 0 to create the depletion layer that will "pinch the current off". That cannot happen when $V_{gs}$ = 0. Devices that are off when their $V_{gs}$ = 0 do exist: N_channel MOSFETs. – Bimpelrekkie Sep 13 '20 at 20:50
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A JFET is unlikely to have a pinch-off voltage of zero as there would only be a couple of hundred millivolts before the gate to channel diode would start conducting.
However MOSFETs with zero voltage threshold are available.
Kevin White
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