Yes, there's a great deal of turtle literature out there. Python3 has a built in turtle module that plots to the native canvas object, as you probably know.
Out-of-the-box Python3 might not be appropriate below a certain age naturally. What reading and writing skills do they have, and what patience for math? The original vision was to make math more fun ("hard fun") and use LOGO as a modality for imparting math concepts.
These days the emphasis seems to be on splitting math from computer science even at the elementary school level, count me a skeptic this will be the best way.
Those learning code + mathematics in tandem, along an integrated course of study, will likely pull ahead.
Our schools in Portland (both public and private) seem to favor using MIT Scratch before introducing a lexical language, if doing programming with kids as young as 3rd or 4th grade.
I'm not convinced there's a need to start that early, not that one size fits all (but in a traditional school, it kind of has to).
The specific pilot program I'm involved in once a week (after school program, elective, costs extra) shifts them over to Codesters coming from Scratch.
Codesters, like Scratch, is available in the cloud through a browser, so used with Chromebooks with Wifi in our case).
If got links to some embedded examples from earlier this month, if curious. One of them (Hexagon) uses the built-in turtle.
The Martian Math one (appended) is deliberately way above their reading level but the challenge was simply to take printed sheets with the source code and match them with the corresponding applications. Connect the dots, so to speak.
Eyeballing source just to pattern match is arguably a useful first step. I also get into some line-by-line analysis.