Derivative of Ratchet. A Ratchling is the offspring of a Ratchet being. Once hatched and nursed to it's Ratchet ways, said offspring becomes a full grown Ratchling.
If said creature is spotted please call the ASPCA as soon as possible as rabbies is a common ailment of unvaccinated Rachtlings.
Girl 2: "That Ratchet girl is having a baby?"
Girl 1: "Yea, She's having a little Ratchling"
Girl 2: "She better have that thing Vaccinated"