Prowl 2 only exists as a toy in the Robots in Disguise line with no bio or story appearances to explain who he is. Robots in Disguise already had a Prowl, and Prowl 2 may have just been intended to be a Spy Changer variation of the same character. A handful of other characters got the same treatment, though most of their Spy Changer toys looked more like them, and they lacked the anomalous "2" suffix. This might have remained simply an odd footnote in Transformers lore, but then the Binaltech fiction used the name "Prowl 2" for its own incarnation of Prowl (who would, in a later retcon, be rolled into a Beast Wars character as "Prowl II").
Some fans pass the Binaltech reference off as merely a nod, since Binaltech takes place in a branch of the Generation One cartoon timeline. However, the Generation One cartoon and Car Robots (the original Japanese version of Robots in Disguise) are actually in the same universe according to Japanese continuity. On the other hand, Prowl 2 wasn't in Car Robots; he was an American addition. On the other other hand, Binaltech's writer, Hirofumi Ichikawa, is famously knowledgeable of non-Japanese Transformers, and he even worked another anomalous Robots in Disguise suffix into Binaltech terminology. Moreover, even if the series are viewed as separate, Robots in Disguise is no stranger to dimension-hoppers.
The upshot of it all is that no one can say who Prowl 2 "really" is. The evidence is simply too scant and inconclusive. Any definitive answers lie only in the realm of fanon.
Robots in Disguise
- Side Swipe & Prowl 2 (Basic 2-pack, 2001)
- Originally an unreleased Generation 2 Go-Bots mold, Prowl transforms into a police car. He has through-axle construction to allow for super-fast rolling in car mode. Like his fellow "new"-mold teammates, his rifle stores under his car mode. He was available in a two-pack with Side Swipe.
- Prowl 2 (Tiny Tins, 2001)
- Prowl 2 was one of several Robots in Disguise toys to be sold as an individual in a Tiny Tins release, with a pocket-sized carrying case. The actual toy is unchanged from the two-pack version.
- The "Super" redecoes of the Deluxe RID Car Brothers were listed in store computers with the numeral "2" following their names. The "Prowl 2" Spy Changer's deco is not dissimilar to the redeco of Deluxe Prowl, and it is entirely reasonable to assume that it was intended as a Spy Changer version of that toy. However, like some other initially-innocuous anomalies, this has grown a life of its own.