Blogs, Journals and Wikis are Blackboard collaboration tools. Canvas does not have Blogs/Journals and they do not import. Wikis import as individual Canvas Pages though the grading options are not retained.
Canvas Assignments, Discussions, Announcements, and Pages have settings that can fulfill the goals of a blog/journal.
For more info
- Blogs, Wikis and Journals in Canvas http://canvas-migration.missouri.edu/support/solutions/articles/11000007935-blogs-wikis-and-journal-in-canvas