Accountable Talk
To me, accountable talk is more "professional talk" or jargon used more for teachers than for kids. I would use "Turn and Talk", Think Pair Share, or even "Let's have a partner conversation" for kids. Teachers can establish expectations about sticking to the topic, respond, listen, etc. when it is introduced. They can have an anchor chart for it with "looks like/sounds like", key phrases, expectations, etc. As a teacher, I've never said "Let's do an accountable talk." It's always "Turn to your partner and discuss..." With the expectations in place throughout the year.