Can もっともっと be used as more and more?


I understand you can say something like

> “彼は強くなるばかり”

To express this meaning but could you say

> “もっともっと強くなっている“

Sorry if this seams like a stupid question I think I just heard it somewhere
and I need clarification. To add to it are there any other ways to say more
and more. (And by this I mean the -er and -er construction.)




I had a very hard time interpreting "もっと強くなっている" as "is getting stronger," (I
had actually written we can't do so) but now it seems I can.  
As I understand it, "もっともっと強くなっている" means "is getting much much stronger than
he was strong before."  
So in a roundabout way it can be describing the same situation as "getting
stronger and stronger" does. 「ますます」or 「どんどん」directly describes the
intensiveness of increase in strength, on the contrary.

I am deeply sorry for my repeated editing.

EDIT  
I had come up with a comparative clause that is likely incorrect("...than he
was strong before"). What I meant was like "He is getting stronger, which will
make him much more stronger than he is now."  
Aside from that, what troubled me in the first place was when we
say「[彼]{かれ}はもっと[強]{つよ}くなっている」we need implicit reference to a strength that we
are comparing to. That makes it distinct from the sentence "He is getting
stronger," for which the Japanese equivalent may simply be「彼は強くなっている」or
「彼はより強くなっている」if you prefer a verbatim translation.  
And as I just learned from [広辞苑]{こうじえん}, this use of「より」as an adverb began in
Meiji Era to translate comparative adjective in Indo-European
languages(「ヨーロッパ語」in 広辞苑) into Japanese.




Yes もっともっと works just as you expect in colloquial sentences, but it may sound
a little too "dramatic" or even "childish" depending on the context. The most
common way of saying _more and more_ is
[ますます](http://japanesetest4you.com/flashcard/%E7%9B%8A%E3%80%85-masumasu/),
which works both in formal and casual sentences.

