These are goslings. According to the internet the one on the left is about 10-12 weeks old. The ones on the right are about 8 weeks old. They don't honk yet. They make more of a weezing whistle.
There's something about their feet. When walking on pavement, it sounds like a spatula on the counter. Slap, slap, slap!
Some of them have bands around their "ankles". For tracking, I suppose.
Oh, here's some ducks!