Celebration of playful creativity!

Design a joyful and vibrant 3D artwork featuring the word JOY in a whimsical, oversized font. Each letter should appear rounded, candy-like, and crafted with glossy, textured surfaces, think swirls, soft ridges, embossed sparkles, and iridescent reflections, all layered with a rainbow gradient flowing smoothly across the word.

Inside the letter "O", add a playful cartoon face, big expressive eyes, a goofy grin, and a tongue playfully sticking out from the center of the "O", as if the letter itself is alive and making a silly face at the viewer. The tongue should be shiny and slightly exaggerated, contributing to the overall whimsy.