I've been searching on the net for several days and can not find nothing about this effect. Even a name for this effect. I want to make a character that can use his tongue to pull objects objects it touches in the extension including the tip.
As mentioned by others, it's likely you want an effect similar to a "snake". Effectively, you want to break down the "tongue" into individual pieces that form a trail, much like chain-links.
The objects you'll want to create should work similar to a linked list - each node will point to potential nodes that can come before and after it. From there, you pick some relative positions near each end of each node where they will visually connect when drawn on the screen. You may want to have a maximum angle at which each node can bend relative to its prior node in order to make it look smooth.
From there, you can simply make a node act special if it is "the end" node, i.e. the following node it points to is null. You can have it manipulate things in whatever manner you'd like at that point.