Yes they can have scrambled eggs. I start treating mine with a small amount at about two weeks old. When you think about it, egg is their first food since it's the egg yolk that nourishes the chick before hatch.
I'd go easy on the milk, but others would disagree with me. Don't want to take a chance on giving the chicks a case of the runs which could kill them quickly.
Duck eggs would be fine too.
When treating your chicks, keep in mind that you want to keep the treats at about no more than 10% of their daily intake of food. They need the complete nutrition of their chick starter at a young age, with their rapid growth.
