No, Galactus, (First App. in FF #48), was a human appearance, (sorta), looking type bad guy. Same physical size, (Tall and Large), as Marvel’s ‘The Watcher’ character. You might be thinking of the ‘cloud’ that the Watcher was disguising earth with to hide it from Galactus’ advance scout, The Silver Surfer, as the SS cruised around the galaxy looking for planets for his master Galactus to feed on. Didn’t work! The FF had to save the day! FF #48-#49 was a great 2 issue storyline.
In still maintain that Galactus was far more "godlike" than James Spad .. er .. Ultron. 😊