The Crossfire comes w/ a 20X2.25 tire and I don’t think anybody makes a 20X2.5
Trials tires are all 19X2.5, they are often called 20’s, and no a trials tire will not fit on a 20" rim or visa versa.
Could a trials tire help you get more spring in your hop? Possibly, depends on the tire.
Check out Sponge’s trials tire thread.