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Whether you cut out the tall frond is up to you, but it is most likely a different palm. Although, difficult to tell which species it might be. Depends on how you want the pot to look. The others look to be the same, Parlour Palms. But a Parlour Palm only grows with one stem, so what you have is a group of many plants. One of those on its own could grow up to about 2 metres tall, with a single slender stem. While they're all crowded together they'll be stunted, but some will probably die off so there won't be so many in there. The strongest/survivors will still be crowded and stunted to a degree. As seedlings/young plants, they're a normal size. Separated they'd thicken up and grow a bit quicker. However, Parlour Palms are a relatively small, thin palm.

You mean thin them, and no way , can they stand nearly that amount of crowding. Even were they several inches apart it might be a stretch to keep them in a three or four inch pot, and three spaced a few inches apart in the same pot would work, but most likely not with stems touching. Trimming involves removing only dead fronds and not entire stems , but if its " thinning" you might cut the ones not wanted completely off so the others can survive. Trying to pull out the extras with the very tangled and congested roots, would most likely damage the roots on the ones you wish to keep and some folks remove the lot, and then replant just the ones they wish to keep after separating the roots on those . Those growers may think that very thick lush growth provided by overcrowding too many seeds in one pot may "sell", but it's totally ridiculous to think the plants can survive such crowded conditions, and getting used to a much less dense appearance is required, if they're not overcrowded.

Yeah thats definitely a parlor palm and I also have a seedling and a large one. I let them both dry out and they do fine especially when they get soaked after. I didnt water mine for a very long time this past winter and I did unfortunately lose a few leaves on the bottom but It didnt thin out too badly and it revealed a beautiful trunk. They are also great bloomers for me and they bloom outdoors on and off all summer but put on there best show indoors during the winter. Also do NOT keep them in full sun or even partial sun. They will burn in an hour in afternoon sun during the heat of the summer, maybe even 30 minutes. I burned off the leaves on a few of mine that way but it is not growing well again in shade. They arent too hard to take care of. Just watch out for overwatering (which shouldnt happen in a good draining pot with good soil), spider mites (they do attack mine often indoors but they dont seem to do very severe damage, and keep them in a very bright window indoors but in complete shade outdoors. Good luck! -Alex