Yes. The best example of something that is popular and homoiconic is Bash. Bash keeps your functions in source code form, though comments may be lost, and they get reformatted. You can see the code when you type "set all", and can copy and paste the definitions back into Bash.

In Common Lisp, the homoiconic feature is the ed function which allows you to edit the source code of a function. Support for ed is implementation-defined!

It may be absent (e.g. in a Common Lisp that compiles everything to machine code). A Common Lisp that compiles all forms and doesn't support the ed function isn't homoiconic.