I believe you meant "Let me hazard a guess".
Frog-marching is where you are picked up by each limb, face down somewhere, although it also means being forcibly taken somewhere against your will, usually to somewhere they don't want to be. It doesn't necessarily imply an inhumane treatment.
In that phrase, the writer is saying that there is a double standard; that a Muslim has a right to promote terrorism, but someone else does not have the right to mock Muhammad under the same Bill of Rights that both people live under. This does imply an inhumane treatment.
[Not a teacher]
Student or Learner