Names are (not-so-) strange attractors. To me, "Elk" in this kind of a setting is "Elk Scheme - the Extension Language Kit"! [1, 2]

[1]: http://sam.zoy.org/elk/ [2]: http://www-rn.informatik.uni-bremen.de/software/elk/

Elk Scheme has been around since nineteen eighty seven. Given the power of embeddedish devices these days, I wonder if Elk Scheme would be a useful embedded language implementation in 2021? Sadly I don't have the cycles to experiment.