I watched all three videos. Sadly, none of those are the noises I heard.
If I didn't know better, I'd swear she either had something caught in her throat, (not likely, this was before breakfast) or maybe a sleep apnea episode. Can dogs get apnea, does anyone know?
I have occasional apnea myself...you know when you wake in the middle of the night gasping thinking you've stopped breathing? (sometimes you have, briefly)
She took two or three large inhalations, then exhaled each time just as hard. It doesn't sound like the trachea problem at all. Definitely not kennel cough. Not reverse sneezing either. I'm not even sure now that I think of it that she was conscious at that moment.
I wish I'd been filming, but it was way early for me and I was just trying to get her comfy so she could go back to sleep for awhile.
She does sneeze, but there's no pollen map for Alaska on that site that I can find. It seems like her sneezing is an excitement thing. When she sees you she gets all wiggly (I think her name should've been Jell-O, not Jenna...lol) and starts pulling her lip back from her upper teeth for a smile and sneezing like crazy.
She also likes to wipe her muzzle on her beddy after eating.
No snoring. She's a very quiet sleeper actually.