Name That Sound...

Ellie has a funny sound she makes a lot these days, and I don't remember John or Eve doing it. She's been a grunter for a while now (particularly while she's eating, which is rather amusing), but this is new. It sort of sounds like a pig, or maybe a bullfrog. I think the sound comes from somewhere between the roof of her mouth, her throat, and her nasal cavities. I'm not sure how else to describe it, but it's funny. I've tried it, and I can kind of get close, but not quite replicate it. I hope she keeps doing it because it's a neat trick!