If you want Gold or Platinum crests, try to get alot of combos before heading into the bananas. Also look at the "try this" screen after a level cause it helps find more bananas.

When you've gotten all of the golds don't think the game is over. There is still one more type of crest, platinum.

Turet tusk is pretty easy.First "CLAP!" to pick up a pinapple grenade,then "CLAP!"
agen when he sucks throgh his trunk/canon (If the trunk/canon is pointed to high, ,jump and then "CLAP!") if he sucks the pinapple grenade into his trunk/canonAfter that his heart should appear along with 4 pinapple grenades.Then go to where the hill slopes down and "CLAP!"8 times (If you have enough time throw the one at the top of the hill too).Repeat proses till he goes down.