Did Gohan ask Piccolo to do fusion?
Gohan said

あっ、だったら、合体技とか、コンビネーションとか、作りませんか？

which can be translated to

Oh, then why don't we create a double-team maneuvers or a combination?
(From unknown English fansub)

In general, 合体技 (gattai waza) means &quot;combination technique by two or more people&quot;. Fusion is one of them, and is probably the source of confusion since in Japanese, ○○と合体する (○○ to gattai suru) means &quot;to fuse with someone&quot; (example: Gotenks). However, it doesn't mean specifically &quot;fusion&quot;. Other examples are Purple Comet Crush and Purple Comet Hurricane by Burter and Jeice.
Combination attack, according to Wikia, means &quot;techniques which combine the different basic-types to continuously attack an opponent to leave no room for counterattacks&quot;. Example is Kibito Kai's Crazy Combination.