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Development of Amnesia: The Dark Descent[]
The Tuurngait Infected appear identical in the Amnesia: The Dark Descent alpha build gameplay to their appearance in the Penumbra series, featuring as nude, pale, humanoid corpses with red mouths and black eyes. They also speak the same voice lines as they do in Penumbra.
Unlike in Penumbra: Black Plague, the Tuurngait Infected do not carry any equipment whatsoever.
The Tuurngait Infected were most likely simply placeholders for Servant Grunts, reusing their assets. In other words, their appearance and sounds were used temporarily; they were intended to be Grunts from the beginning.