Mangolem

The Mangolem is the third plant unlocked in Roaring Revolution and the last plant unlocked in First Revolution. Mangolems push against trains to prevent their movement, but take 4 damage a second and are eventually killed.

Suburban Almanac Entry
"I am not a robot," states Mangolem. "If I were a robot, I could not express joy. Ha. Ha. Ha. Error. Error. Error."

Plant Food
Mangolem gains back its health and, if it is stopping a train, shoves the train offscreen.

Strategies
In Roaring Revolution, Mangolems can prove extremely useful, as they can hold back both trains and zombies at the same time. A common strategy is to place a column of Mangolems on power tiles on one of the rightward columns. This proves to be useful, as every Mangolem involved can shove back trains only limited by the amount of Plant Food one has.

Outside of Roaring Revolution, Mangolem acts as a more expensive Wall-nut with a slightly faster recharge.