Rule SG6 states that one allowable method of introducing Match Load Triballs is by "placing the Match Load gently onto a Robot from the Drive Team Member’s Alliance." The robot must be contacting the Match Load Zone or the Match Load Bar.
It is very easy to gently place Triballs on top of an Alliance robot in contact with the match bar, doing so in such a way that the Triball rolls off the robot and is no longer in contact. This allows multiple Triballs to be entered into play in a row, and then the whole group can be plowed across to the robots home scoring zone.
Can a series of Triballs, in effect, be rolled across the top of a stationary Alliance robot and placed into play?