From Muppet Wiki

Prototypes were built of Ernie, Bert, Cookie Monster, Super Grover, and Oscar the Grouch.

Prototypes of their accessories were also built. The accessories included:

for Ernie: Rubber Duckie, banana, and letter E.

for Bert: Pigeon and letter W.

for Cookie Monster: cookie, tea cup, and letter C.

for Super Grover: cape, helmet, and letter G.

for Oscar: trash can lid (Oscar would have been permanently inside the can, and both Slimey and a Scram sign would have been permanently attached to the trash can) and letter O.

These toys would have also had special action features. Grover would have had bendy arms, Ernie would have been abe to have his arm move up, Bert would have also been able to have his arm move up, Cookie Monster would have had the ability to move his arm and head, and Oscar could have been pushed into his trash can.

It was announced that series two would have included Big Bird, Telly Monster, Count von Count, Guy Smiley and Two-Headed Monster.

Super Grover	Ernie	Cookie Monster	Bert
Character sketch for Fun-4-All line by Philip DiResta