Official, not yet
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There is a third-party class "[The Grafter][1]", although I haven't tried it myself and can't really assess it:

[![enter image description here][2]][2]

> Did you ever get jealous of those sweet abilities monsters have? This is no longer an issue! With the Grafter class you can slowly but surely become a monstrous abomination yourself with all the sweet perks it brings! This is a class for those who like to hunt down monsters for their parts and then use those parts in battle!

> The grafter class includes three archetypes: the monster, the symbiont and the witch.

Besides...
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There are a couple of related spells and magic items:

* The necromancy "[Graft][3]" spell allows you to attach a dead limb.
* The infamous Eye of Vecna and Hand of Vecna from the DMG attaches instead of your own eye or hand




  [1]: https://www.dmsguild.com/product/262773/The-Grafter
  [2]: https://i.sstatic.net/k9q0L.jpg
  [3]: https://www.dndbeyond.com/spells/198672-graft