Yes, unfortunately there are also fake accounts at Nostr. If you look closely, these are easy to spot. Unfortunately, at Nostr you can only mute these fake accounts and not block them.

nostr:npub1teawtzxh6y02cnp9jphxm2q8u6xxfx85nguwg6ftuksgjctvavvqnsgq5u nostr:npub19mduaf5569jx9xz555jcx3v06mvktvtpu0zgk47n4lcpjsz43zzqhj6vzk #Nostr