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am I able to restore the wallet in different wallet software (eq Bitcoin Core)?
You will not be able to restore FROST secret shares into a non-frost wallet, at least until they add functionality. BUT you will be able to recombine a threshold number of key backups into an xpriv, without our app, which can be imported into sparrow/bitcoin core etc.
do I also have a way to back up the descriptor?
An awesome thing with FROST is that because there's just one group public key, which can be reconstructed from two keys (or their public images), you can rebuild the descriptor from two backups or their devices. No need to additionally back the descriptor!