Did Japanese submarines use the “Long Lance” torpedo?

No. The Type 93 Long Lance was longer than the submarine torpedo and was used by surface ships such as cruisers and destroyers. Submarines used the Type 89 prior to the war. That was replaced by the Type 95 kerosene/oxygen torpedo prior to the war. They also used the electric Type 92 torpedo.

The “Long Lance” was not a Japanese name for the torpedo. After the war, the Type 93 was nicknamed the “Long Lance” by the U. S. Naval historian Samuel Eliot Morison. The Japanese knew the submarine torpedoes as the Type 89, the Type 92 and the Type 95. The Type 89 was an older kerosene/compressed-air torpedo. The Type 92 was their electric torpedo, and the Type 95 was the kerosene/oxygen version.