maybe something like that https://marketplace.atlassian.com/plugins/com.stiltsoft.confluence.quiz/server/overview?utm_source=atlassian&utm_medium=blog&utm_content=new-way-to-use-Confluence-employee-training&utm_campaign=quizzes-traffic-sources&_ga=1.8201714.1908622603.1468827703?
You could have a look at the Developer Diaries Add-on (only for the server version, not for cloud). While this is not strictly an add-on for Niko-Niko it supports team members to keep a developer diary or journal. Each member can track the excitement for the day and the mood on each page in the journal.
This Track Team Mood Howto shows how to create a chart with the team's mood data.
While the add-on is available for free it requires the commercial projectdoc Toolbox to be installed. The projectdoc Toolbox supports teams to employ agile documentation. So the developer diaries is an example of using the toolbox.
Both add-ons are available on the Atlassian Marketplace:
Disclaimer: I'm one of the authors of these add-ons.
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