adoptable

[uh-dop-tuh-buh l]

adjective

capable of being adopted; suitable or eligible for adoption: an adoptable child; a resolution found to be adoptable.

noun

a child who is considered suitable for adoption: fewer adoptables than in previous years.

Origin of adoptable

First recorded in 1835–45; adopt + -able

Related formsa·dopt·a·bil·i·ty, nounnon·a·dopt·a·ble, adjectiveun·a·dopt·a·ble, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

I didn't cherry pick this list; it's the first page of search results for adoptable, relatively young kids.
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Megan McArdle
March 29, 2013
Rescue groups and individuals have come forward stating that the animals they gave PETA were healthy and adoptable.
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Tricia Romano
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Genetic traits are identified and matched in the genetic banks of adoptable children.
The Civilization of Illiteracy
Mihai Nadin