The question is not so much "can he?" but more "why would he?"
As has been said before, the right footed left back is a thing because left footed players are less common.
Also, we have like 6 players who can play right back if we need, why would we train our starting left back to play there?
No, the question is "why would Lampard?"
And the answer is that he could utilise the skills of all his defence to make do and mend with the material he was left with...and adding to that a LB/LWB and maybe another CB gives him that opportunity.
Look, we are all over the place on the right side of defence still. Coleman isn;t looking a great bet to make a lot of appearances and he;s the only one who can play all defensive formations.
We need defenders in and we would hope FL knows that they have to be utilised and / or adapted to help us get through this season....because shipping 66 goals like last season again will bury us.