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Walnut is over stimulated at the sight of other dogs that is why he is refusing treats. Suggest working with him at a distance from other dogs, that he can maintain some self control, could be twenty feet, might be 50 ft. Once you figure out his threshold, the point he doesn't over react, reward him for looking and staying calm. Slowly decrease the distance over days, weeks, only moving closer when he is able to stay in control.
When you are going to the park he is anticipating the fun time, he is over excited and loses it. Don't expect him to listen to you inside the park, if he is already 'wired' and not listening outside the park. Practice approaching the park calmly. I use 'penalty yards' when my dog can't behave, as soon as he starts pulling, I stop moving, if he continues to pull, I cue 'this way' and we move further away from whatever he is onto. I get the sit, praise/reward it, and move closer, slowly, repeat. The only way he gets to go where he wants to go, is by keeping the leash loose and staying calm. Be consistent and practice calm approaches with anything that gets him excited, and don't let him approach if he is not staying calm, stop or move away if need be.
Once inside the park, have him sit to be released, once released, give him some time to burn some energy, time your recall for when he is taking a break from playing. When he comes, praise and reward if he will take it and immediately release him to go play, showing him that coming to you does not always mean the fun is over. Repeat, repeat. Dog owners often create dogs that won't come when at the dogpark by only calling the dog when it is time to leave, teach him that is not always the case.