These were taken from the game Yoshi No Kuruppon - Oven De Kukki, which as you can probably tell, was a Japanese release. In fact, it's the Japanese release of Yoshi's cookie. Not only did it contain the YC game, but it also contained these three recipes, and mini-games built around them.
And cute Yoshi sprites n_n
My Japanese is far from perfect, since all I know is Hiragana and Katakana and enough random words to keep me off of disturbing websites. I simply transcribed the script into the NJStar Japanese Word Processor, and then used its (apparently incomplete) dictionary as well as the game's visuals to piece together the recipes above.
They had recipes for the Heart Cookies, Flower Cookies, and Battenburg Cookies. They didn't include anything after baking the cookies, so I've had to append my own notes from previous cooking experience (I took two years of it in highschool and did some in my spare time) onto the bottom of each recipe for you to use. I've marked them out for you.
I'm too lazy to convert grams to ounces though. Get with the times, America.
If you wanted to make the doughnut cookies, you just need to shape them by hand. If you want to put poppy seeds on them you can, but I've never used them or made a poppy seed cake so I can't really help you there.
If you wanted to make the diamond cookies, you just follow the heart cookie recipe, but use a different cookie cutter and different jam.
If you wanted to make Yoshi cookies... good luck. I imagine you'd have to get a cutter made specially, then use a knife to slice into the dough to outline the features of the face.
If anyone uses these, please comment and tell me how it went! I'd love to know if this really works or not.
All recipes (c) Nintendo. Translation and appended notes are (c) to me.
EDIT: We've got a confirmation that the Battenburg/Icebox cookies work!
EDIT 2: I've found an egg substitute, for anyone who wants to know. Just substitute half an egg with a tablespoon of cornstarch.
EDIT 3: I corrected "Wheat Flour" to "Cake Flour" as it was the biggest mistake here, but I advise you to go look forward in my gallery for "Revised Battenburg Recipe" if you want to make the battenburg cookies.