I've tried long jumps, jumps with a dive at the end which cause me to ground pound half the time instead of dive, running jumps and now I'm going to take a flying leap and shut it down. I wasted 2 hours trying to do this today. It's a the Swamp Hill checkpoint. Klepto lands on top platform of the stairs and ground pound platforms.
There are two of those caterpillar things on the left and a purple poison waterfall with coins over it to the right.
Like I say I think it's me being bad at jumping and given a choice I would have abandoned it and gone off somewhere else.