I expect, M0nica that some places may call the tines "prongs" but to me it sounds clunky.
If you are designing or working with forks you will call the very tip of the tines "points" and where they join onto the fork, "roots" - there are lots of parts to a fork I seem to remember - but like you, I haven't heard the tines (or points) called "prongs" so expect its localised.
I think the indents between the tines are called "slots" by the way - not a very nice description in my opinion, and too rigid.
Trump is eyeing up Mali as his next war zone


