How to stop the Cheese?

I play a tanky Top. I do fine myself but I have problems preventing my teammates from dying to cheesy champs. The main culprits are Rengar, Yasuo, Zed, Leblanc, Katarina... and to some extent Fizz, Ekko, Graves and others. Despite my warning them... Basically when the other team has a Rengar, every lane other than top has to play the game differently- Group up earlier etc. But they still die to the cheese... letting these champs snowball outta control. What can I do? Any advice?
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