RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Tenti Pineapple
The Old School RuneScape Wiki also has an article on Tenti Pineapple.

Tenti Pineapple is an item acquired during the Tourist Trap quest. It is used to appease the Mercenary Guard inside the Desert Mining Camp cave. Al Shabim gives you the Tenti Pineapple in exchange finding the Technical Plans and producing the Prototype Throwing Dart for him.

Players who attempt to use a Knife on the pineapple will get the following message:

"This pineapple is too small to cut up into rings.
But it's very, very juicy!"

See also