1N-COUNT 小鱼 A tiddler is a very small fish of any kind. 小鱼 [British, informal]
2N-COUNT 小人物;小玩意儿 If you refer to a person or thing as a tiddler, you mean that they are very unimportant or small, especially when compared to other people or things of the same type. 小人物;小玩意儿 [British, informal]