In ano hi mita hana no namae wo bokutachi wa mada shiranai, (lit. Yadomi jinta = jintan honma meiko = menma anjou. In real life, i doubt he would have just run away for help.
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We know that all of them have a nickname, but i don't understand poppo's nickname. We still don't know the name of the flower we saw that day), there's a recurring theme of flowers revolving around. It is never explicitly stated how menma died exactly.
It is known that her body washed away so if.
Did poppo really fail to save menma as she was drowning? Where did the nickname poppo comes from? However certain events, and symbolisms do hint towards how she most likely did die.