Polly was a name give to a captive Zyglot.
Polly lived in captivity. After seeing her, Ivan Asimoff began campaigning for her release. In the end he assigned the help of the Sixth Doctor and Frobisher. Together they forced her release. Once free she began to bloom. (COMIC: Polly the Glot)
Behind the scenes Edit
Her name is likely a pun on Polyglot, an individual who has mastered multiple languages.