Search:

River bank wood......?

Use what you can find..... as you would in a "survival situation".
I you are gonna make a habit of this....buy a spear fishing head....

I guess I haven't heard of "chumming" carp with worms?.....so have no clue.

But yeah, I would thing your chances are pretty good of spearing one with your 4 point spear....if they are there to...