We found one dictionary that defines the word future-in-future tense:

Art (1 matching dictionary)

1. Linguistic Glossary (No longer online)

▸ Words similar to future-in-future tense ▸ Usage examples for future-in-future tense ▸ Idioms related to future-in-future tense ▸ Wikipedia articles (New!) ▸ Words that often appear near future-in-future tense ▸ Rhymes of future-in-future tense ▸ Invented words related to future-in-future tense