I modelled a Bullywug with spear after the official guide illustration. It's downloadable for free and I hope you Will have fun with it :) it's one of my first models so it has some slight mistakes and not that much detail but I hope you will still have fun with it. I also have a Bullywug mage model on my site if you are interested for your campaign. For the print I recommend to out some heavier supports under the left arm, as it tends to break off for being heavy. I hope you have fun with it and I await sour feedback.