YES

We show the termination of the TRS R:

  f(g(X)) -> g(f(f(X)))
  f(h(X)) -> h(g(X))

-- SCC decomposition.

Consider the dependency pair problem (P, R), where P consists of

p1: f#(g(X)) -> f#(f(X))
p2: f#(g(X)) -> f#(X)

and R consists of:

r1: f(g(X)) -> g(f(f(X)))
r2: f(h(X)) -> h(g(X))

The estimated dependency graph contains the following SCCs:

  {p1, p2}


-- Reduction pair.

Consider the dependency pair problem (P, R), where P consists of

p1: f#(g(X)) -> f#(f(X))
p2: f#(g(X)) -> f#(X)

and R consists of:

r1: f(g(X)) -> g(f(f(X)))
r2: f(h(X)) -> h(g(X))

The set of usable rules consists of

  r1, r2

Take the reduction pair:

  lexicographic combination of reduction pairs:
  
    1. matrix interpretations:
    
      carrier: N^1
      order: standard order
      interpretations:
        f#_A(x1) = x1
        g_A(x1) = x1 + 1
        f_A(x1) = x1
        h_A(x1) = 1
    
    2. matrix interpretations:
    
      carrier: N^1
      order: standard order
      interpretations:
        f#_A(x1) = x1
        g_A(x1) = 1
        f_A(x1) = 2
        h_A(x1) = 1
    

The next rules are strictly ordered:

  p1, p2

We remove them from the problem.  Then no dependency pair remains.