Also:

In France and other countries, jeton is also a small (as a token, so to speak) amount of money paid to members of a society or a legislative chamber each time they are present in a meeting.
(From Wikipedia)

Actually, any french token or chip could be called a jeton, whether clay, plastic, or even metal. It's become common (at least on this bb) to call any acrylic chip made by B+G or other european chip makers a jeton. It's not really proper usage, but I don't have any suggestions for a better term to refer to these plastic chips.

How do you pronounce it?

[zheu to(n)]

Or let this french lady pronounce it for you. You need iTunes. Click on the loudspeaker in the link.