I've heard an amazingly large range of vocalizations from mine: growling, screaming, squeaking, a kind of whiny complaining, an angry squirrel noise like a CH-CH-CH-CH, chirps, whistles, grunts and a peevish "nyeeaahhh". That's just the vocalizations! Other noises include clunking, thumping as they land on glass, the tink-tink while they climb on the screen covers and cricket-hunting noises. Most of mine are in my bedroom and apparently I'm not a very sound sleeper, but I really enjoy hearing them.
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Terri
9:14:12 crested geckos: Bear, Goldfish, Kermit, Brimstone, WildSpatter-Spots-to-Spare, White Lips, Pouncer, Studley, Randy, Big Red, Olive, Smudge, Belle, Brilliant, Tina, Brick, Toni, Beauty, Shine, Harley, Lady, LemonDrop, AllVees, Stunner, Squeak (RIP), Bling, Squeaker, Stripe, Redhead, Speckles, Harrys, Penny, BonusBebe, RedHot, Puzzle and Snickers.