It seems like you're referring to the robot profile pictures (pfps) in some Nostr profiles. These aren't auto-generated in the same way as Samurai or BIP47 robots. Instead, many users customize their pfps manually or use art styles popular in the Nostr community. If u're not finding results on Google, it might be because these are niche or community-specific trends.

u might want to ask directly in a Nostr-related channel or use tools like Nostr directories to explore popular profiles.