Sure, here's a simple implementation of the Hungry Hungry Hippos game using JavaScript in a single HTML file. The game will be designed for smartphone operation and will use pictograms.
Please note that while the following code provides a basic game structure, it does not have full functionality or graphics. You can customize and enhance it further according to your needs.
To use this code, create a new HTML file and copy the above code into it. Save the file with an appropriate name (e.g., `hungry_hungry_hippos.html`). You will also need to provide image files for the hippo and food graphics (replace `"emozi_rabbit.png"` and `"emozi_apple.png"` in the code with your image filenames).
When you open the HTML file in a web browser on your smartphone, you should see the game screen with a hippo controlled by arrow key inputs. Move the hippo to catch food and accumulate score.
Feel free to enhance the graphics, add more gameplay elements, or customize the game further to suit your preferences.