Unripe (Green) Foxtail Millet Heads

Would these be safe to feed to canaries and finches?

The choices are to feed now or not at all, as the plants are about to be weed-whacked, but I know the birds would love them if they’re not toxic at this stage. (This is true foxtail millet grown from old birdseed, not a weed.)

…although the wild birds aren’t eating them. Maybe they’re not so tasty.