Is there an English term that describes the whistle you'd make with two fingers/one finger and thumb in your mouth? Maybe those variations have separate names. Googling got me wolf whistle but that looks like it's specifically about a two-note thing and not so as much about the putting hands in mouth format. Also there is a kind of expressing lasciviousness vibe which is not what I'm after.
I have also looked this up and like others have said I've only found "finger whistling" according to Wikipedia or simply "whistling with your fingers." Link