I don't know about a toki pona Plover dictionary, but a fun fact about toki pona and Plover is that the language's creator (Sonja Lang) was a very early participant on this very Google group, and actually put me in touch with the artist who designed Dolores, our project mascot! You can see her contributions if you search the archives. Unfortunately Plover was in a very rudimentary state at that point and she didn't stick around long enough for it to become usable for her, but I still think of it as Plover's brush with fame, haha!