Double Shot (BTD5 Ninja Monkey), Bloons Wiki

Extreme Ninja skill enables him to throw 2 shurikens at once.BTD5 description Double Shot is the third upgrade of Path 1 for the Ninja Monkey in BTD5. This upgrade allows the Ninja Monkey to throw 2 shurikens at once, in turn allowing a maximum poppage of 8 bloons per shot (up to 4 bloons per shuriken). The Double Shot Ninja is not a particularly strong tower, although with Seeking Shuriken it is decent against spaced bloons below Rainbow Bloons. Its main use is as a stepping stone for Bloonjits

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Barbed Darts (BTD5), Bloons Wiki

What do these units have that is NOT true for the other units who aren't on the list. (Hint: It's not “Monke,” “they can pop bloon” and such) : r/btd6