The phrase "forestall questions" is correct and usable in written English.
You can use it when you want to mention that you will answer questions before they are asked. For example, "In order to forestall questions, I will explain the process in detail."
To forestall such questions, the explanation of the unusual staggering of images should have been explained in the caption.
He didn't confront such issues in his talk, and he managed to forestall annoying questions by announcing in advance that he was sick of them.
However, this may just forestall the question as to how to account for that wrinkle a particularly talented animal builder with notable design intent in the larger story of animal builders most of whom have less or no such intent.
And a happy ending often forestalls nosy questions about the darker days.
If Petraeus hopes that leaving on personal grounds, however painful, will forestall hard policy questions — and perhaps leave his political reputation intact — he is likely mistaken.
She lets him in, they have their token drink, then things get rated X". "How can I see the video?" Stanley asked and just as soon realized he'd better amend the question to forestall the laughter of the marines watching through the two-way mirror.
The New York Police Department, confronting possible layoffs for the first time in three decades, is grappling with two new questions: Can it forestall layoffs by finding other savings?
An earlier attempt to bring the case to court was forestalled by the question of whether Loughner was even fit to stand trial.
Should President Obama or his successors seek to attack other nations in similar circumstances in the future -- Iran, for example, to forestall its nuclear ambitions - the question will be asked, "Why can't Congress be involved, as it was in Syria?" This is an institutionally powerful question.
Instead, the question is: How can we forestall its full-fledged resurgence upon our departure?
