crew
The use of the CREW mechanic is broken on all cards I have looked at. They can use TAPPED creatures to crew them. It is even true of the description on the cards in game.
Mtg Oracle Ruling
9/29/2017 Any untapped creature you control can be tapped to pay a crew cost, even one that just came under your control.
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Greenman#04308
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[Deleted User] commented
This is just reminder text. And since it is not possible to tap what is alresady tapped, no, you canot use tapped creatures to crew a vehicle.