Yes, γγ γκ in the word (and not at the beggining), are pronounced (in most words) as ng.
Well, double consonants like γγ, λλ, σσ etc. cannot be in the beginning of a word, troll! ;) Therefore llama = λάμα.
For anyone interested in syllable breaking rules, such pairs are always split. No exceptions - for a change!
Well, I was referring to γκ mostly, which is very common to be in the beggining of a word.
I know you were, I added my comment for clarity and a friendly meant nudge. :)