YES

(VAR x y z)
(RULES
  +(+(x,y),z) -> +(x,+(y,z))
  f(+(x,y)) -> +(f(x),f(y))
  f(f(x)) -> x
)

(COMMENT
Termination is shown by EKBO with interpretations on natural numbers

  f_A(x1) = x1 + 1
  +_A(x1,x2) = x1 + 1
  +#_A(x1,x2) = 0

weights

  w0 = 1
  w(f) = 0
  w(+) = 0

and precedence:

f > +
)