An unengaging Bullfrog and a silly cartoonish Shrew are the friends in this latest trio of dimensionless exchanges in the Frog and Toad format. The first story, in which Shrew pesters Bullfrog to share (a wash. . . breakfast. . . anything), is just as tiring as she, on the verge of falling asleep, claims to be. (One suspects though that Shrew and maybe Carrick meant to say ""tired"" instead.) The second applies the slightly funnier Epaminondas routine to Bullfrog's self-assigned baby-sitting job. (Mallard advises that ""You sit on top of them until they crack open,"" Bat says you hang them upside down, etc.) And the third, involving mutual insults and a flight from Otter, is too pointless to summarize. ""Muck"" is Bullfrog's favorite word, and he might well apply it to Carrick's murky illustrations, with their somber undertone that couldn't be less in synch.