Thank you, sir, for the lesson, but I am still a little confused. I am trying to visualize this, but I don't see the connection with the frog. One person grabs your legs and one grabs your arms? Or is it that each of the people apprehending you grabs an arm and a leg? Sorry to be so dense.
I always took it as meaning that the person is wearing handcuffs in front with a chain that connected them to ankle shackles. The prisoner has to shuffle or hop. Then again, as has happened numerous times past, I could be totally wrong...
When "frog-march" (also sometimes called "the frog's march") first appeared as slang around 1871, it meant to carry a prisoner (or a drunk being ejected from a bar) face down, with each of four husky men holding an arm or leg. The term comes from the resemblance the recipient of the procedure bears to a frog with its limbs splayed out. Today, however, "frog march" is usually used to mean the less dramatic (but equally effective) method of forcibly propelling a prisoner forward while pinning his arms behind him.