Hello,
My little guy flaco is also making honking noises but is nothing like the 3 of those video shown.
I never have a camera available when it is happening but I did find another YT video that is having the same problem as Flaco.
Here is the video:
It happens when he is eating to quickly or gets extremely excited. Normal running around doesn't trigger it.
I guess what im asking is if this is a normal issue or something that should be looked at by a vet?