Hi Dbrookside,
Welcome to the Apple Community.
Re: "There are a couple of frames I need to remove. How can this be done ?"
Seems there are a few options:
If you wish, you could likely make a few duplicate copies of the video,
and edit the copies one at a time, (keeping the original safe and untouched for now).:
eg: crop / trim the first section and save with a new name on one duplicate copy
on another duplicate copy:
crop / trim the second section (leaving out the unwanted frames) and save with a different name
Apple support's article: Edit photos and videos on iPhone – Apple Support (AU)
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Haven't used it myself ... but seems there is also a free "Clips" app for iPhone
Clips - Apple
Edit clips in Clips – Apple Support (AU)
Make a video in Clips – Apple Support (AU)
Clips in the App Store (requires iOS 15):
https://apps.apple.com/au/app/clips/id1212699939
Clips User Guide – Apple Support (AU)
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Re: can I add like IMovie app to cut the individual parts out
Yes, you can, if you have iOS 15.3 or later (required), and enough storage space on your iPhone. (Size : 618.2 MB)
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
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Re: IMovie app for iOS:
Is free in the App Store
https://apps.apple.com/au/app/imovie/id377298193
Apple support's article (link below):
Says :
"When you split a clip, you can adjust the duration of each section, remove unwanted sections, or add different titles to each section".
and
"iMovie places a None transition (also known as a cut) between the two newly created clips".
(You can change this to another type of transition if you wish)
Complete article: Trim and arrange videos and photos in iMovie - Apple Support
All the best :-)