M'athchomaroon, zhey Adogs. Welcome to the Dothraki forums.
I think the place you might want to start your thread is under the 'A Song of Ice and Fire' forum.
There is some other work being done on the other identified languages in the ASOAIF series. But I don't think the giant's tongue has been mentioned by anybody. So, if this interestis you, you might just want to have a go at it.
BTW, this board is usually pretty quiet. But there are a couple of us who watch it regularly, and are there to help out new people.
You will find most of the current Dothraki information on the wiki. The dictionary is also up-to-date, and I try to keep it that way.
Last, but not least, consider joining us for our weekly IRC chat, on Monday evenings at 7 PM Pacific time. Dothraki creator David Peterson often joins us, and it is always an interesting discussion!
Enjoy Dothraki!
Fonas chek,
Hrakkar