I'd never heard of this, so when I came across these two citations from an Australian publication, thought it sounded interesting. If anyone comes across further articles, let me know.
Crowe, Alan. 1997. A futher instance of tongue regeneration in an snake. Herpetofauna. 27(2):50. [50 Lighthouse Road, Woonona, NSW 2517, Australia]
Valentic, R.A. 1996. Partial tongue regeneration in a captive black-headed python Aspidites melanocephalus (Krefft, 1864). Herpetofauna 26(2):48-49