Speaking in tongue is simple , I will use my knowledge in linguistic to explain why.
In this example we imagine that I'm a charlatan who will trapped some Christians.
I can say something like that : rolAbi panun qilem kRlt (pseudo-words) (micro-pause like a virgule) kOs zanum (pseudo-words) giyo (the word yogi reversed) qinamon (cinnamon in Hebrew who is mispronounced voluntary).
Now in IPA (International Phonetic Alphabet) :
ˈɹɔˌlaːbi ˌpaˈnun qiˈleːm krlt (micro-pause like a virgule) kos zɑˌnuːm ɡiˈjəʊ ˈqinamɔn.
Conclusion : You can mix real languages and modified them too you can create pseudo-words. Also you have another solution who is more simple , you can articulate all phonemes than you want.
In this example we imagine that I'm a charlatan who will trapped some Christians.
I can say something like that : rolAbi panun qilem kRlt (pseudo-words) (micro-pause like a virgule) kOs zanum (pseudo-words) giyo (the word yogi reversed) qinamon (cinnamon in Hebrew who is mispronounced voluntary).
Now in IPA (International Phonetic Alphabet) :
ˈɹɔˌlaːbi ˌpaˈnun qiˈleːm krlt (micro-pause like a virgule) kos zɑˌnuːm ɡiˈjəʊ ˈqinamɔn.
Conclusion : You can mix real languages and modified them too you can create pseudo-words. Also you have another solution who is more simple , you can articulate all phonemes than you want.