I don't know what's it's called!

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Okay when I was younger I was in some store that went out of business I was about probably 2 at that time.. I can remember me playing with some toy that had flat plastic fishies in between two see through plastic with blue liquid... And when you poke the liquid in the plastic the fishies you can play with the liquid... -.- kinda like the thing below. http://creativebits.org/files/blood.jpg I don't know what those things are called!!! (';' ) This kid I look after sometimes, I noticed they have a similar toy to that except it's a green round froggy pond with the blue liquid also.. -,- I just want to find out what these things are called since I kept getting random stuff on the google search engine not relating to "plastic in between liquid toy." Heehee these things are amusing... XD Please help!?