We don't have synonyms for teneral yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are general and General.
(adj) :
(entomology, of an arthropod, etc.) In the pale, soft-bodied state that follows moulting, before the hardening and darkening of the cuticle, during which the creature is able to expand.
(adj) :
(entomology, of an arthropod, etc.) In the pale, soft-bodied state that follows moulting, before the hardening and darkening of the cuticle, during which the creature is able to expand.