I've searched far and wide on what feels like hundreds of meadows. They do not spawn naturally, both in multiplayer and singleplayer. They're so cute, I really want em. The bounce bugs spawn in fine, peanut crops aswell, etc. It's just the elephants. I play with a few mods that add new biomes, I'm suspecting that that is what's causing them not to spawn.
(Oh the biomes you'll go)
(Biome makeover)
(Better nether)
(Better end)
(Terrablender)
I'm on 1.18.2 fabric. I really like this mod q-q

It's different for me... I also have most of these mods, can see elephants everywhere but had to go through 5 different meadows to find peanuts.