Not quite, legal tender means if someone owes you money, you have to accept it.
Tim DeChristopher spent 21 months in prison despite how he "had raised sufficient funds for an initial payment to the BLM (which the BLM refused to accept)."
https://en.wikipedia.org/wiki/Tim_DeChristopher#Trial
(I bring this up because I'd always wondered about how why that case fell out that way, and apparently it can't, per the common meaning of the terms, so my understanding of legal tender seems correct?)