I watched Lamb chop as a kid constantly and my dad video recorded everything back then. I was unaware until recently that there were episodes missing. I was able to find my recorded off of tv tapes of a few episodes of the series. As soon as I finish viewing them for condition I'll find a way to upload them to YouTube.
Update: After watching the videos we have I have discovered these episodes. -"Gold Diggers" -"Lamb chop Learns to Walk" -"Peer Pressure" -"Toulouse La Chop" -unknown, no name on title card just says act 1, synopsis- 'Charlie hourse wants new basketball shoes. Trades hush puppys bicycle for new shoes' -"born to dance" -"I write the songs' -"Lucky Puppy" -"senoritas lamb chop"
They were all ripped to one DVD from VHS I'll have to figure out how to rip it from the DVD on to computer. May take some time since I would then have to separate ten into the different episodes.
I used to watch Lambchop as a kid too and I miss that show so much. I was not aware that there were missing episodes either. Unfortunately I do not have my old video recordings from when I was a kid so I've probably lost episodes I'd give anything to still have today (which may or may not have been from your list, I don't know anymore.) Howver, I did manage to find one episode (I always forget about it since the tape is not specifically labeled Lambchop's Playalong) the last time I watched the tape with the Chanukah special recorded on it. I have the Passover special too which obviously isn't missing.
Back to the one episode I do have, I can't remember the title or the air date. From memory it has the following segments (there may be more I'm forgetting): Shari teaching the kids how to count on your knuckles, the "Alone Time" song, the segment where Shari shows a clip from her original television show from the 60s (I'm 26 so definitely too young to remember that show but still never forgot seeing the clip as a kid.) Anyway, the clip from the 60s showed on LambChop's PlayAlong I believe had something to do with LambChop or Charlie Horse pretending to be a waiter. If anyone would like to see this, I'll work on uploading it to dailymotion sometime soon if no one has seen it before.
Anyway, I'm glad you managed to uncover old episodes of LambChop's Play Along. I used to have "On Our Way to School" and two other video tapes as a kid. I probably haven't seen every episode that was ever made so I would love to see these if you ever manage to get them onto youtube.
Also on the other hand (and sorry to get a bit offtopic, your thread kind of reminded me of this) I don't know if the Charlie Horse Music Pizza is considered lost media, or at least partially found. In my opinion it is since I haven't seen much surface on the internet other than what is on youtube. I used to have that recorded on tape as well but I lost that too. I only remember an episode where Diana Krall appeared. I hope someone manages to find missing episodes of that show too.