[rational_indian]

Technically it is a triode but that word would be misleading here since this device is more like a diode with a MOSFET like insulated gate.

[kazinator]

That word would be misleading because it has been taken to refer to vacuum tubes.

I would call this a "trioptode". That incorporates the "tri" and "ode", plus a reference to that it is optical: the third terminal modulates light.

[detourdog]

I will start refer to them as trioltodes.

[dfox]

And the hollow-state triode is more or less the same thing as JFET, except it needs higher bias voltages.