Sure:I have not heard this expression. Can you put it in a complete sentence and give us some context, please?
Ah don't be so defeatist! I'm sure there could be a translation if we knew what the show was about etc. However, in terms of English only "talkback classroom" seems not to be a set phrase and so has no meaning in itself. It suggests some sort of forum where people get together to give feedback on something - but that could be completely wrong. The Aussies should be waking up around now so maybe we'll find out...It looks like the name of a TV program. It would not be translated.