If on single and admin commands and not want spawn it in and tame like a normal person here is what you do

Step one use command AdminCheat GMSummon Sauropod_Character_BP_C 99999999999999 (14 9s)

Step two pheromone get

Step three follow a trapping tip

Step four pheromones in bronto tummy

Step five enjoy imprinting your giant bug while I plot to flame another one