Summary

My remix adds a VL53L1X laser sensor to brooksben11's "Motion-Triggered Hypnotoad with Sound"...
https://www.thingiverse.com/thing:3944899

( Note: I did not change anything to this thing other than scale it up to 150% of the original size in my slicer, Cura. )

I added the laser sensor mount to srbecerrita's "Hypnorock for Hypnotoad"...
https://www.thingiverse.com/thing:3755555

using Thomx Ju's "VL53L0X Screwable Case"...
https://www.thingiverse.com/thing:3763978

The VL53L1X I used fits this case perfectly but I did enlarge the opening for the sensor slightly.
( Note: in the photo, I left the sensor cover temporarily unpainted to make it easier to see )
To protect the wiring that runs to the sensor I made a bottom plate that can be glued to the bottom of the rock.

Rather than use brooksben11's motion sensor electronics I instead set up the laser sensor to act as a Raspberry Pi theremin using rbnrpi's writeup at...
https://rbnrpi.wordpress.com/new-sonic-pi-theremin-using-time-of-flight-laser-sensor/

I'm still working on the perfect sound for the toad.
To flash the WS2811 LEDs I wrote a simple python script using the information at...
https://learn.adafruit.com/neopixels-on-raspberry-pi/python-usage

I believe it would be possible to flash the LEDs in sync with the sound but wanted to keep the setup as simple as possible.

Hardware:

WS2811 12mm Neopixel equivalents...
https://www.amazon.com/dp/B01AG923GI

I had some of these leftover from a previous project, I like them because they are cheap and come with all of the line/noise filtering components preinstalled. They fit snugly in the toad's head without glue ( again, the toad is scaled to 150% ).

VL53L1X Time-of-Flight (ToF) Laser Ranging Module...
https://www.amazon.com/DWEII-Measurement-Extension-Compatible-Raspberry/dp/B09V4DS888

Demo video on YouTube...
https://youtu.be/xZRzqoYQcFE