When using Falinks V's "Iron Defense Formation" Ability or Falinks' "Team Attack" attack, do I get to count any Falinks V I have in play too?
Yes, because Falinks V has "Falinks" in its name.
Source: Rebel Clash FAQ (2020-04-18), TPCi Rules Team (2020-04-30)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH2_109
SWSH2_109
SWSH2_110
SWSH2_110
SWSH2_185
SWSH2_185