Have you seen any of the TikTok Gramps videos? He does great imitations of animals, characters, and even objects. He gets tons of hits because he also shows YOU how to do them. He's been at it for a few years now.
One of his classic clips is where he takes an empty paper towel roll and does a really good roaring lion. He doesn't use props for his crying baby or barking dog, where he shows you how to do a big pup, and a small one.