https://bitcointalk.org/index.php?topic=1960307.1260;topicseen
and LiteDoge
https://bitcointalksearch.org/topic/annldoge-litedoge-such-fast-such-stake-wow-proof-of-stake-20-1308769
I know there are many more but not sure about the others that are still around and family friendly.
They are all worthless. Will people utilize low volume and pump these to line themselves with free bitcoin, yep. Does that make it a good "investment" oh my God no. Do yourself a favor and don't get caught up in all the crap. Don't buy something simply because they "meme".