Yeah those "Heyyyyyy Froggie Babyyyyy!" 's of Grover with the back hits were classic! I remember one time Kermit ducks and Grover goes,"Ahhhhhh!"
Kermit proudly says, "Missed me." Grover replies, "Froggy, I was just going to give you a little pat." Kermit says, "I'm well aware of your little pats!"
There were a lot of classic Kermit and Grover skits. Those two together were almost as great as Bert and Ernie! One that clearly comes to mind is:
Kermit and Grover are demonstrating short and long. Kermit says he'll do short, and hops for a short time. Then he says, " Now Grover will show hopping for a LONG time." Kermit continues this with running in place. After these exercises, Grover is exhausted and demands that they switch the short and long roles. So Kermit says, "Okay, you tickle me for a short time." Grover responds, "Oh boy this is going to be fun!" (Oh Grover!! Couldn't you see it coming, ol' buddy?!!) After Grover tickles Kermit for about 2 seconds, then Kermit, of course, says, "And now I will tickle Grover for a LONG time!"
And Kermit tickles away at Grover for a long time and the segment ends with him still tickling poor Grover and Grover shouting 'Stop!" and laughing.