No. The BIP39 mnemonic dictionary contains 2048 words. This means that there are about 3.6x10^16 possible combinations for your 12-word mnemonic seed, even if you know the right order of those 7 known words. It gets even crazier if you don't know the word order at all. Trying to brute force those 5 missing words? Forget about it! It's flat-out impossible.