I just got one so I have modified my version of htop for the Raspberry Pi to work on the AML-S905X-CC (Le Potato) that shows cpu temp and current frequency in case anyone is interested.
Here's the GitHub : https://github.com/leeadama/htop/tree/lepotato
See the Readme for Build Instructions.
Once you have it built and installed, you add the temp and frequency display like any other meter. I.E. press F2, arrow all the way to the right and choose Temperature Sensors, press Enter to add it and Enter to confirm.
Then just repeat the process for the FreqMeter.
Tested on Ubuntu Desktop - Mainline Kernel
Linux lepotato 4.14.32-meson64 #2 SMP PREEMPT Thu Apr 5 19:31:23 CEST 2018 aarch64 aarch64 aarch64 GNU/Linux
Thanks
Lee