"Meeting internet dudes is what being a dude on the internet is all about!" ~OSG
If you can jump to the edge of each platform they're on (I'm guessing you mean the part where there are 3 on steps up), then you can kill them by another jump atop or just several tongue hits... or you can be on the step below, and jump and hit with the tongue, takes a few seconds, but it's foolproof for not getting it.
Level 5 is a pain for jumping, but once you get it down, it'll be a cinch. The second half of 4 is tough too.
"Meeting internet dudes is what being a dude on the internet is all about!" ~OSG


"Meeting internet dudes is what being a dude on the internet is all about!" ~OSG
"Meeting internet dudes is what being a dude on the internet is all about!" ~OSG