and are you pretty sure you can make a larva move on a trigger because you cant even make it move in game so i doubt you can with a trigger
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Trigger:
Players-
whatever player owns larvas
Conditions-
Player X Brings at least 1 larva to [hatcheries]
-OR-
Always
Actions-
Run AI script Junk Yard Dog at [larva]
Move Larva at [larva] to [move larva]
Run AI Script Junk Yard Dog at [move larva]
Preserve Trigger
Simple as that. Be warned though, if you choose to use always as a condition and you have hyper triggers, be prepared for some SERIOUS lag
Edit: Whoops... locations Hatcheries and Larva are the same one

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that doesn't work larva can't run on junk yard dog script, it will always atempt to move back to its hatchery no mater what you do, and if you dont have a hatchery where it was spawned from the larva will just die.
theres a way to freeze larva though. all you do is give control of the larva to another player "i think thats how its done" or maybe i got it backwards.