It’s hard to compare things that are so different like that, but I will try.
Scuttlebutt: Reticulum is a network stack for routing data in real time, not a decentralized social network.
Nostr: See Scuttlebutt
IPFS: Reticulum transfers data, it does not store it (though some protocols that work over Reticulum like LXMF optionally have functionality that allows for temporary message storage)
Yggdrasil is the closest analog to Reticulum you mentioned, but unfortunately from a cursory search I could not find any details about how it works. I can see that it currently works only over IPv6 (with IPv4 tunnels of some kind), unlike Reticulum which works over anything.
