No, Mastodon and Lemmy account did indeed can talk to each other because there are part of same Fediverse. But from server to client (masto server to icecube, lemmy to jerboa/liftoff), they use different api (some sort of language the apps use to talk each other).
Lemmy can only login to Lemmy appz like Liftoff, Thunder and Jerboa. And Mastodon can only login to their apps.
this post was submitted on 01 Jul 2023
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You can view and reply to Mastodon toots and they can post/comment on Lemmy
But the experience is pretty clunky. And no you definitely can't use a Mastodon app to login to a Lemmy account or vice-versa