Bentreciprocating sawandjigsawblades are commonplace.
To straighten, lay the blade flat on a scrap 2x4 with the bend arching up.
Strike the blade a few times with a hammer to flatten out the bend.
Be careful not to hit the teeth on the blade, as that will damage them.
Check out the video above for more.
Unbend a Sawzall or Jigsaw Blade| John Heisz (YouTube)