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There is.
It's in a dictionary:
"Толково-словообразовательный
РАЗГОВОРЧИК м. разг.
1. Уменьш. к сущ.: разговор.
2. Ласк. к сущ.: разговор."

You can say "Ну и разговорчик завели,...

Some examples:
1. Lesson. Students are talking not about the topic. The teacher can say: "Разговорчики прекратили!"
2. Rank of soldiers. Somebody are talking. Sergeant can cry: "Разговорчики в...

This word usually have negative nuance.