esp32 adafruit huzza32 touch button
https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf 

On page 8 there is a chart, under the "function" colunm it lists which pins are TOUCH and shows the GPIO# for them. TOUCH pins 0 through 9 are listed here. I have noticed that there doesn't seem to be a gpio0 and gpio2 brought out on the feather which are TOUCH1 and TOUCH2(theres probably a reason for it).

Pins on the feather that have touch capability:

A5, 12/A11, 13/A12, 14/A6, 15/A8, 27/A10, 32/A7, 33/A9

I haven't tested it yet but will in a day or so and confirm.