It is a Pickup Truck. It is a Truck and Pickup is the type of truck. Hence why we have called them pickup trucks for decades. Much like Box Truck, Semi Truck, Tow Truck, Tank Truck, Dump Truck, Stake Truck etc. All are trucks and the name preceding truck describes the type of truck.
What is the debate?
Note I have truck plates and pay truck tax on my plate. The state says it is a truck.