Are there any fluids which are both viscous and volatile? I'm looking for a viscous fluid which will evaporate (completely) rather quickly.

If propylene glycol evaporated like acetone, that would be the dream ticket, but neither the viscosity nor the volatilty need be quite that high.

Non-toxic would be a plus!
Volatility and viscosity are 2 properties going each against the other.

A volatile liquid has rather small molecules a/o  rather weak intermolecular bonds.

A viscous liquid has rather big molecules a/o  rather strong ( often multiple ) intermolecular bonds.

A partial solution to the task is to have composite liquid, a volatile liquid mixed with either viscous liquid ( e.g  glycerine),
either with dissolved thickener ( like polyvinylalcohol or vaseline/wax )