wooden nickel

Short definition from Wiktionary

Noun

1. 1
   A wooden token that is manufactured and distributed by a particular business as an advertising gimmick or which can be exchanged for goods, many of which have now become collector's items.
2. 2
   The smallest amount of money imaginable.
3. 3
   A worthless replica of a coin, usually intended to defraud.
4. 4
   Something that purports to be something other than it actually is, especially that purports to be more valuable than it actually is.