Suggestions that there were space men is far more plausible than angelic beings with magical powers, That's the problem with some christian's, they can believe in weird supernatural events written in a two thousand year old book but can't accept the existence of Alien life or the fact there were active during bible times.
Christians don't believe in beings with magical powers . Magic is a term not used for such heavenly beings .
Angels are messengers from heaven. Heaven is in space and beyond, so the expression space men can be identical in some ways with angels from heaven . We know there is life in the heavens and such beings are recorded in scripture angels are one of those life forms . They appear like men and we see other beings with wings etc . They would be alien to this world in some sense , mankind is made from the dust of the ground but angels are not of this world .
The spiritual world is also a real world but different than ours spiritual beings. May be considered by some as alien or foreign to our world or from space ( heaven)
Sometimes it's a matter of terms and how you understand them
But these frog like creatures are evil and they are spirits of Devils
Spiritual beings have been able to manifest the self physically at times
The similarity to a frog like , big eyed thin creature is obvious . John didn't say they were frogs but frog like or like frogs . Frogs have those big eyes slimy skin smooth thin arms and legs
There is a great deal of mystery about principalities and powers in high places and spiritual realms and angels etc but they do exist and many may use other terms to define them
Angels could be seen as men by sine or beings of light that flash to and fro that are perfect interdimensional beings etc some may go as far to call them aliens . But what does alien mean in this context? Simply that they are alien to this world. Somehow people think by calling angels aliens or Devils that it disqualifies the biblical spiritual beings and pushes them into a past old fashioned idea. This is not true