A:
No. Some Roku TV brands will support bluetooth keyboards with usb dongle, but TCL specifically states they don't. I have a TCL series 3 TV & have confirmed bluetooth keyboard/dongle will not work.
However there is a possible workaround. Discovered I could run the Roku app on my Galaxy s10e. Then paired my logitech K380 bluetooth keyboard to my phone & I can use physical keyboard to enter into the Roku app which puts it into my TCL series 3 Roku TV for searches etc..