TikZ plot for Enneper's minimal surface?

You could use pgfplots.

documentclass[tikz,border=3mm]{standalone}
usepackage{pgfplots}
pgfplotsset{compat=1.17}
begin{document}
begin{tikzpicture}
begin{axis}[hide axis]
 addplot3[surf,z buffer=sort,%
    %mesh/ordering=y varies,
    domain=0:1,domain y=-180:180] 
 ({x*cos(y)-x*x*x*cos(3*y)/3},
  {-x*(3*sin(y)+x*x*sin(3*y))/3},
  {x*x*cos(2*y)});
end{axis}
end{tikzpicture}
end{document}

This is an Asymptote version of parametric representation;

// https://tex.stackexchange.com/questions/570157/tikz-plot-for-ennepers-minimal-surface
// Enneper's Minimal Surface
// ref:https://mathworld.wolfram.com/EnnepersMinimalSurface.html
//
// EnnepersMinimalSurface.asy
// 
// to get EnnepersMinimalSurface.png, run
// asy -f png -render=4 EnnepersMinimalSurface.asy
// 
import graph3;
size(200,0);
currentlight.background=paleyellow+opacity(0.0);

currentprojection=
  orthographic(camera=(-25,50,60));

triple f(pair t){
  real r=t.x, phi=t.y;
  real x=r*cos(phi)-1/3*r^3*cos(3*phi);
  real y=-1/3*r*(3*sin(phi)+r^2*sin(3*phi));
  real z=r^2*cos(2*phi);
  return (x,y,z);
}

surface s=surface(f,(0,-pi),(1,pi),nu=12,nv=200,usplinetype=Spline);
draw(s,paleblue+opacity(0.4),meshpen=nullpen,render(merge=true));