With WP-Polls Field type you can fetch the ID of the poll of your choosing. Useful for example when getting polls to a front-page.
Add to your repositories section in composer.json:
{
"type": "vcs",
"url": "https://github.com/digitoimistodude/acf-wp-polls-redux"
},
Then add to require:
"digitoimistodude/acf-wp-polls-redux": "dev-master"