Is free-style the front crawl

Answer 1

If they had to I think they would. Front crawl is the fastest type of stroke so they would try to use it for most of the event and not others like the breastroke, backstroke, butterfly, etc.

Answer 2

Generally, yes. But technically front crawl is the stroke consisting of moving one arm after the other, side breathing and flutter kicking, whereas freestyle is technically any stroke.