So, what kind are your two? They are very cute!
The taming stuff kind of goes along way when you are the surrogate mom. I have great success with dries meal worms - put some in your hand and let them see what you have. They have strong instincts to eat protein and worm shaped things fit the bill. That will overcome the fear of new things and big hand shaped things. ;-)
Pretty soon they will see your open hand and associate the words you say - whatever you call them - with the joy of protein treats. I called my first set Chicklets and the second set are Littles. Having another call that isn't an actual word but a whistle or cluck helps, too. You want to show the babies what is good to eat and they want you show them as well. Thankfully MOST of that food searching is instinctual!
Another treat is kind of a trick. White rice grains (cooked) look a lot maggots to a baby chicken and they are hard wired to go for it. You can't throw a lump of rice at them, though. Just a couple grains at a time like they are Bon-Bons.
Getting your chicks to associate you with the BEST treats and see your hand as the bringer of deliciousness is key. Don't reach from above, approach them open-handed at their eye level.
I would so love to see them enjoying your garden! A bug feast, perhaps?
These are my Littles, last week (4 weeks):