I had created two free blogs on the Blogspot and posted some content.
Can I import my those two blogs content to WordPress?
If I apply for AdSense, will my content be considered as duplicate content?
Import the content. And either redirect (301) old content to new one or just delete your old blogs.
Yes, you can migrate to WordPress from Blogger and Import those content.
Refer my guides for this purpose:
No, when you migrate to WordPress, your content will not be considered as duplicate. Because, I got my adsense approval, only after I migrated to WordPress/