Hi! I think this grapple hook system is pretty realistic. However, if you want to make this system less realistic but funnier, I think you can do two things:
1. lower the gravity, it gives more time to the player to grapple to another spot
2. make so that when you grapple, the frog gets closer and closer to the grappling point (just like the grappling system of the Pathfinder in Apex Legends, that is really fun to play imo)