Yup, there are also B+ and B* trees!
The Taming of the B-Trees https://www.scylladb.com/2021/11/23/the-taming-of-the-b-tree...
"B+-trees have been supported since ScyllaDB Open Source 4.3, and our B-tree implementation was added in release 4.5. They are hidden, under-the-hood optimizations ScyllaDB users benefit from as we continue to evolve our infrastructure."