I buy frozen veggies(if they are not in season) and just warm them up in a pot of hot hot water, for about 2 minutes, they thaw very quickly. you can try beans,pea pods, broccoli (one of their favourites) cauliflower, peppers(green,yellow,red) sliced and diced.
there is a TON of good info on this forum for foods for birds of all species, just go into the 'parrot food, recipes and diet' section
you said he was on pellets but has not eaten any since you've had him?am I correct?
he will keep eating hoping to feel full, I've seen it before with newly weaned babies that I buy....it's due to lack of his nutritional needs not being met.
BUT that is ok, you can fix that for him, and it won't take long.
Once you start offering a variety of foods(you can literally put in as many seed cups as you like filled with different foods) he should be fine, you'll notice a difference in their attitude as well.
Like us, if you at MacDonalds every day, how would you feel?....same thing for birds, the require healthy nutritional foods just like we do.
I would suggest putting liquid vitamins in his water for now, to boost him immune system, calcium is also required and mandatory, along with Vit.A,D, and iodine block to help with their thyroid.
is she is a hen, she will retain the pearl pattern(one of my favourites!)...it's just beautiful, if it's a male, he will start to show some sign of whistling & singing as early as 6 months. the pearl pattern you see could molt out in about 2 years, if it is male.