To get the squirrel out of the tree: get the glass jar from the shack in Loamsmouth and use it on the lake with the farting fish - this will give you a jar with a fish inside. Use this jar on the squirrel hole and the squirrel will leave the hole, letting you climb the tree.
To get the gold tooth out of Wild Bill Hiccup's mouth: first get the rope from the gallows by using the cutters on it. Then use the rope on Wild Bill Hiccup, and again on the bed - You already have used the string on the gold tooth and also the door. You can now go outside and close the door and then go in again and pick up the gold tooth.
I am stuck again after that, so best of luck.