For sure. And, at the risk of being pedantic, a plug-in hybrid can still be a parallel hybrid - series vs. parallel is about how the ICE power gets to the ground, whereas plug-in vs not is about the existence of a way to charge the hybrid battery packs separate from the ICE engine or regenerative breaking (or whatever else that's not electric power from a wall outlet).

And most plug-in hybrids are (parallel). The "plug in" part is usually referring to (even if technically wrong) the electric subset being able to reasonably move the car alone, instead of being just a substitute to the ICE in near-idle cruise and an assistance at peak load. The combination of reasonable utility electric-only and serial is usually referred to as "electric with range extender" instead of hybrid.