According to comicbook.com, there was once a time where the beloved Groot looked like Frankenstein's monster.
Groot had a look very reminiscient of the classic folklore character early on in development.
Charlie Wen ? Marvel Studios visual development maestro ? share concept art of the different version of Groot across his social media.
"FrankenGroot," as Wen calls the art, was quickly passed over by the powers that be.