This guide will let you know how to get the Icy Grappler in Fortnite.
You can only buy this from the location on the map, as shown in the image below.
When you get there, you have to enter the house and then speak with the unicorn. Buy the icy grappler for 400 gold bars, as shown in the image below.
With this, you can get anywhere on the map very easily, and the best thing is you can jump over the rivers.