Is Scarecrow in Batman Arkham City

Scarecrow does not make an appearance in batman arkham city however there are a bunch of Easter eggs showing he is probably still alive such as the boat Easter egg there will be a boat rite near Nora Freezes location use your code sequencer to to break the code: city of fear then a hatch will open go down and you will see a guy strapped to a chair tied to fear gas the second big Easter egg is in the third riddler room after you rescue the hostage take out your remote controlled batarang and aim where the hostage was you will see fear gas in the corner last on the amusement mile bridge you'll see his mask.