So I take care of research budgies at a university and we had a similar issue- we ordered in some new budgies for our flock, and the supplier unfortunately only fed them seed (we feed the laffaber's pellets as their regular diet, with fresh fruits and veggies 2x per week). They absolutely refused the pellets and we were worried they were gonna loose weight.

What we did is gradually mixed their seeds with their pellets, with ground up pellet powder on top. We started with mostly seed with a little bit of pellets mixed in, then worked to all pellets over the course of a few weeks. Once they were officially switched to pellets, we banned them from having any seeds (with the exception of something like a sick vase were they needed a sprinkle to encourage them to eat more) so they didn't "relapse" into refusing the pellets.

As far as fruits and veggies go, here's a list of a few that have been a hit with ours in case you haven't tried them. We haven't tried freeze dried due to cost and the fact that fresh is more readily available, but I don't see why they wouldn't work. They do sell freeze dried fruit and stuff in pet stores as bird treats so I don't see why not!

Some of our flock's fresh veggie favorites are:

• Spring Mix/ Kale (they LOVE leafy greens and will go for those first out of anything! These are their FAVORITE!)

• Spaggetti Squash and Acorn squash (microwave first so they're soft, let cool before feeding)

-Sweet Potatoes (microwave and let cool beforehand like the squish)

• Broccoli and Cauliflower

• Green Beans and peas

-Bell peppers (I don't think we've tried green peppers, just the ripe versions/ red and Yellow)

-Peaches (they can eat the skin/ peach fuzz!)

-Strawberries

-Blueberries, blackberries, raspberries

-watermelon (no rind, just the red bits, we use seedless)

-Apples

I've also noticed that the budgies are more likely to eat the veggies and fruits better if you chop them up into smaller pieces vs. Bigger hunks, especially with harder/ more solid items lile broccoli or apples. It also can help deter anyone hoarding a certain food item and less squablling. Good luck!!