What are my options?

[Caldera]

18 minutes ago, daeumtnaot said:

So if they exit Thailand by land on Cambodian passport, enter Laos on US passport, will that work?  Then they can re-enter by land on their US passport.  

 

That would depend on whether Laos would accept them to switch passports at the land border.  

 

You cannot switch passports at a land border. 

[zzzzz]

32 minutes ago, daeumtnaot said:

So if they exit Thailand by land on Cambodian passport, enter Laos on US passport, will that work?  Then they can re-enter by land on their US passport.  

 

That would depend on whether Laos would accept them to switch passports at the land border.  

NOOOOOO
they need fly out on the passport they entered on , THAN can enter on US
If they go overland MUST use passport they entered Thailand on

[daeumtnaot]

14 minutes ago, zzzzz said:

NOOOOOO
they need fly out on the passport they entered on , THAN can enter on US
If they go overland MUST use passport they entered Thailand on

Can they go overland to Laos, use the passport they entered Thailand on (Cambodian), and then fly back into Thailand on the different passport?

[Caldera]

23 minutes ago, daeumtnaot said:

Can they go overland to Laos, use the passport they entered Thailand on (Cambodian), and then fly back into Thailand on the different passport?

 

Yes.