The "parrot" part of "stochastic parrot" is quite an ambiguous choice. Taken literally, it's referencing an animal that's actually quite intelligent and capable of complex, novel tasks but has no way to connect those to human language. How I've always read this though is the more literary meaning of "parrot" as "a thing that repeats words with no context". Perhaps "stochastic photocopier" would be a clearer metaphor.

Or perhaps tape recorder would reflect the linearity of the input/output strings