Sure you can use it. Even some Nokias (those older ones without Windows or
Android).
It's pointless to look whether Trisquel has it or not. It's up to the Android
system. Before 2.2 (I think) you had to install another app or something.
You hook up the USB cable provided, and in the phone configuration ->
wireless -> tethering. If the phone is connected it would magically work
after a short handshake with Trisquel.
Maybe F Droid has some tweaks for the menus, I never used it. But with
regular Android there should be no need for another app for the devices made
in the last few years.
You can do it through Bluetooth as well, but it's more complicated as you
need a receiver with a free driver - kernel module - and myself I have never
done it.
Somebody above points out you can make the phone a Wifi hotspot. That has a
lot of drawbacks the main advantage being portability. The battery will drain
under your eyes. Also you can't connect at the same time the phone to one of
the free Wifi hotspots offered by your phone company.
