I have got - I've got They have got - They've got
Ex: I've got to go!
Its not commonly said as "i have got" because it sounds strange, therefore it is condensed. Technically it is proper english, its just not common to say and people will think you're strange if you use that wording.
Swedish actually pronounces "de" as "dom" and apparently it is now even allowed to write "dom" even though that's not really the proper writing. My explanation as to why that is would be that, as you probably know, Sweden, Denmark and Norway were unified for a long time and had one languge in which the word for they was "de". In Danish and Norwegian it is still pronounced that way but in Swedish it has been changed to that "dom" by natural language evolution while conserving the writing.