I have two treasures left to find and have hit a brick wall! I just can't work out what to do next. I think I need the mushroom hat to get to the crab boss on Tomba Island, but the blue mushroom that lets you bounce higher hasn't grown so I can't get up there. I have the sprint boots and jump boots; am I missing something?!

I'm looking forward to the answer, this has been really frustrating!