Which term refers to birds that hatch in a more developed state and can somewhat feed themselves?

The term that describes birds that hatch in a more developed state and are capable of feeding themselves to some extent is precocial. Precocial birds, such as ducks and chickens, emerge from the egg with their eyes open and are typically able to walk and forage for food shortly after hatching. This contrasts with altricial birds, which are born in a much less developed state, requiring extensive care and feeding from their parents before they can fend for themselves.

Fledglings refer to young birds that are in the process of developing their feathers and learning to fly, but they may still rely on parental support for food. Juveniles is a broader term that encompasses young birds that have not yet reached maturity, which can include both altricial and precocial stages. Thus, the specific attributes of precocial birds fittingly describe the developmental state indicated in the question.