Manual log splitter. Great for splitting small logs and making kindling. Mounts into a large log. Easier to use than swinging an axe. It is similar to the one shown described in this review.
https://allaboutlogsplitter.com/logosol-manual-log-splitter-review/
This is a video of another similar tool:
https://youtube.com/shorts/IVzDNhYfwqI?si=6DYkXUoUfqnyFH6L