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Fennel, being a surface syntax for Lua, uses Lua tables to store code, and its macros operate on tables. It has some quirks though, as there's no real unquote-splicing for example, as you can only append to the table's end (like with list* in some lisps). This isn't as problematic as it can seem though.
Clojure is a lisp with immutable Vectors, HashMaps, Lists, Sets built in to the language.
I also wrote a simple scheme-like interpreter (nothing to be really proud of tbh), which uses custom tree data structure, and it was quite painful to implement some things for it, because a) I knew nothing about Lisp at that point, and what I was doing at all, b) it was my first project in Rust besides tutorials :D
Janet uses tuples instead of lists to store code AFAIK. At some point in time it was considered naming it Tupper, short for TUPle PRocessing instead of lisp processing.