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Hi there! I get what you mean! That is very possible. But the system I created is only a template for 1 item. You will need to add another "Math Function" that makes a variable value random for said item. And then another. Then you will just correspond it with the actor sprite that will pop up above player once received. It's quite a tedious process to include other items. But I will see if I can make a different fishing system version.

Here's a guide for you maybe you can do it:

If $CatchFish Value 3,10 (this is what I did, the catch function ranges from 3-10 which is connected to a 3-10 second timer)

therefore you will catch a fish within those seconds.

What you can do is

Retain the random formula but change what comes out if the value becomes ___

So that being said, you can make it if value is 1 = it will change the actor to a boot. 
If value is 2 it will change actor to bread. If value is 3 = a fish. So on and so forth. 

But be reminded that there are limits to the actors okay? You may opt to do the animation frames though if actor limits are an issue.