Frog token

The RuneScape Wiki also has an article on: rsw:Frog token

Frog token
Released							1 August 2005 (Update)
Members							No
Quest item							No
Properties
Tradeable							No
Equipable							No
Stackable							No
Destroy							Drop
Examine							I can use this at the Varrock clothes shop.
Values
Value							0 coins
High alch							0 coins
Low alch							0 coins
Weight							0.01 kg
Advanced data
Item ID							6183
Twisted League							Yes

A Frog token is a reward from the frogs random event. These tokens can be exchanged for either a Prince outfit or Princess outfit (depending on gender), or a frog mask, by talking to Thessalia in Varrock, and selecting option "3. I have a frog token...". Thessalia will then prompt you with, "That entitles you to a free costume! Do you want a frog mask or a [prince/princess] outfit?"

Frog tokens cannot be withdrawn as notes and will not stack in your inventory when more than one is acquired.

Once the player has received the prince/princess outfit and Frog mask, the player can exchange tokens for additional copies of the outfit or mask.

Item sources

For an exhaustive list of all known sources for this item, see here (include RDT).

Source	Level	Quantity	Rarity
Kiss the frog	N/A	1	Always