Origins of the mimic

The mimic seems like an obvious monster - a squishy, sticky blob that can disguise itself as an object. However, does anyone have a pre-D&D reference to such a creature, epecially given the mimic's other features (intelligence, speech, inability to mimic metal)?

Three possibilities to start off with:

- The Blob
- Reed Richards (Mr Fantastic) from the The Fantastic Four
- The Greek legend where Theseus journeys to the underworld, but is trapped by a stone chair which grows around him.

Any others? Thanks.

I would guess the short story "Colony" by Philip K Dick, 1953. Spaceship lands on new planet to colonize it, the people discover that objects are being duplicated, only the duplicate tries to kill them. It could duplicate metal, though.

I don't think the blob could do anything like those. Those were more the inspiration for the oozes.

Maybe also HPL's "Shoggoth" from At the Mountains of Madness. They are intelligent, can mimic shapes and speech.