Green’s Dictionary of Slang

frogmarch n.

also frog’s march
[the image of a spreadeagled frog]

a method of carrying a drunken or recalcitrant person, whereby one holder each takes a limb and thus suspends the individual in mid-air.

Eve. Standard, Clerkenwell Police Report 18 Apr. n.p.: In cross-examination the police stated that they did not give the defendant the frog’s march. The frog’s march was described to be carrying the face downwards [F&H].
[UK]Daily News 4 Oct. 5/2: They had to resort to a mode of carrying him, familiarly known in the force, we believe, as the frog trot, or sometimes as the frogs march The prisoner is carried with his face downwards and his arms drawn behind him [F&H].
[UK]Bird o’ Freedom 19 Mar. 1/1: And then he gets the frog-march to the nearest Tealeafs [F&H].
[US]Bentley & Corbett Prison Sl. 10: Frog’s march is a method prison guards use to carry and transfer difficult, hard-to-handle inmates. This method consists of four officers each grabbing an arm or a leg and carrying the inmate, face down, parallel with the ground.