Once Upon a Rhyme (1950)

Casper the Friendly Ghost doesn't like to haunt and wishes he could be in Mother Gooseland. He gets his wish and frightens the spider away from Little Miss Muffet. He them comes upon the old lady in the shoe but frightens her away, also. He is depressed, but when he rescues Red Riding Hood from the wold, Mother Goose rewards him by making up a rhyme about him. IMDb.

Casper's Spree Under the Sea (1950)

Casper is kicked out of the Society of Ghosts when he admits he does not like scaring people. Dejected, desperate and friendless, he decides to drown himself. And, evidently, confused, also. There, he discovers that he has friends among the fish. When all of his new friends, including Goldie, the pretty goldfish, are caught in the net of two fishermen, Casper rises to the occasion and the surface, frightens the two fishermen away, and becomes a hero to the fish. IMDb.