In the Larry Episode you may not have noticed that when Larry told us his real name ( Kcid Nosyarg) remember that? Well if the Titans weren't to shocked that a dude literally came out of Robin's head they would of realised that Larry's name was Robin's spelled backwards and that it was Robin's secret identity (but apparently even Robin himself was to shocked to notice)
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Teen Titans(original) Stuff That You Didn't Notice At First
RandomUm I sorta explained it in the title