To be honest, i didn’t even know I3C was a thing, and i still don’t know all the details - but that doesn’t keep me from looking at devices for it.
dToF LiDAR sensor:
https://www.mouser.se/ProductDetail/STMicroelectronics/VL53L9CXV0VE-1?qs=Omd18uQ5iJFry6Pb1UJSJQ%3D%3D
What weird and wonderful stuff have you found?
Not a device I found, but in theory it should be possible to emulate i3c on a RP2350, which would enable a lot of fun stuff. So far I mostly only found the other direction, which acts as a controller and not a target though: VL53L9-Arduino/VL53L9-Pico/lib/i3c/README.md at main · earlynerd/VL53L9-Arduino · GitHub
There is also a list of i3c devices here: I3C Devices Database - MCUs, Sensors & Interface ICs | Binho
I3C is I2C compatible (for 400kbps and 1Mbps) so not for everything we would need to select from I3C components for TOH
There are several prototyping brands out there. The following system however looks very interesting, because it commonly uses the I²C bus (to which I³C is compatible for most parts AFAIK) at 3.3 Volt - which exactly conforms with the TOH specification:
With very little effort, you can daisy-chain any combination of sensors, displays, buttons and other stuff to fill the entire area of your TOH, connect it to the TOH base circuit for proper interfacing with your Jolla Phone and have fun with it.
Pick your favourites. 
And if you know other brands with similar systems, please post them here.
I just found the MikroElektronika Click boards™.
Even if you filter their collection by I2C/I3C interface and 3.3 Volt input, like it’s done in this link, you still get more than 1000 products. 
To contribute to the original question of this topic:
There is the Renesas ZMOD4450 “Gas Sensor Module for Refrigeration Air Quality“. From its datasheet: “The ZMOD4450 Gas Sensor Module is designed for detecting gases associated with food ripening or rotting and is targeted for use in refrigeration air quality (RAQ) applications.“
It only has an I2C interface though, not an I3C interface.
A prototyping board is available here. Just hold your Jolla Phone into your fridge and it will tell you if your food and drinks are still edible. 
