Country tag for Siam is:
SIA
If you want play for Siam HOI4 you could use tag command:
tag SIA
To annex Siam in HOI4 you could use annex command:
annex SIA
To delete all Siam units you could use deleteallunits command:
deleteallunits SIA
To add interests on Siam you could use add_interest command:
add_interest SIA
To remove interests on Siam you could use remove_interest command:
remove_interest SIA
To start occupation on Siam you could use occupationpaint command:
occupationpaint SIA
More country tags for HOI4 or more cheats for Hearts of Iron IV