NO

Problem:
 +(x,+(y,z)) -> +(+(x,y),z)
 +(+(x,y),z) -> +(x,+(y,z))
 +(x,y) -> +(y,x)
 +(s(x),y) -> +(x,s(y))
 +(x,s(y)) -> +(s(x),y)
 *(x,s(y)) -> +(x,*(x,y))
 *(s(x),y) -> +(*(x,y),y)
 *(x,y) -> *(y,x)
 sq(x) -> *(x,x)
 sq(s(x)) -> +(*(x,x),s(+(x,x)))

Proof:
 Containment Processor: loop length: 1
                        terms:
                         +(x,y)
                        context: []
                        substitution:
                         x -> y
                         y -> x
  Qed