Since there is a patch coming out soon that will have real IEDs (demolition class and explosives ammo class as presently in WinSPWW2) then you will have a few more to muse over
!. Plus some of the oddities in HEK etc may well have been addressed. If not, then next release.
Demolition (with a radio) can be remotely triggered (including by the AI), without it is only a trip hazard. Large demolitions can drop bridges. A demolition with a napalm chaser is a 'proper' fougasse.
I have set up some AI picks in the new patch to buy some IEDS in the defence and sometimes other battles as well (PLO, Mujadeen, Iraqui insurgents, VC etc)...
An infantryman with an explosives class 'suicide vest' is a suicide bomber. A 'fertiliser bomb' explosive charge on a truck is a suicide truck, and with a napalm chaser added, a suicide petrol tanker.
As to existing items:
A 'pole mine' is usually a shaped charge on a stick - at least for the WW2 Japanese lunge mine.
A lot of the explosives in the OOB though were fanciful things the OOB designers added 10 odds years back as cute names for something that went 'bang', I think. So improvised close-assault A/T items, or added to fortifications as a close-in hazard.
Andy